HBSE Class 12 Chemistry MCQ Important Question Answer 2024

Class 12 Chemistry Important MCQ Question Answer solution with pdf. Here We Provides Class 1 to 12 all Subjects NCERT Solution with Notes, Question Answer, CBSE and HBSE Important Questions, MCQ and old Question Papers for Students.

• Also Read :- HBSE Class 12 Important Questions [Latest]

HBSE ( Haryana Board ) Solution of Class 12 Chemistry MCQ important Question And Answer solution for 2024 exams.

HBSE Class 12 Chemistry MCQ Important Question Answer 2024

---

HBSE Class 12 Chemistry Chapter 1 – Solutions MCQ Important Question Answer 2024

---

1. Mole fraction of a solute in 2.5 molal aqueous solution is:
(A) 0.43
(B) 0.043
(C) 4.3
(D) 43

Answer

Ans – (B) 0.043

---

2. Correct expression for elevation in boiling point is:
(A) ΔT_b = K_b.m
(B) ΔT = K_f.m
(C) π = CRT
(D) None of these

Answer

Ans – (A) ΔT_b = K_b.m

---

3. In the following compounds which has minimum boiling point? Most Important
(A) H₂Se
(B) H₂Te
(C) H₂O
(D) H₂S

Answer

Ans – (D) H₂S

---

4. In the given Alkyl halides which one has minimum boiling point?
(A) C₂H₅F
(B) C₂H₅I
(C) C₂H₅Cl
(D) C₂H₅Br

Answer

Ans – (A) C₂H₅F

---

5. Which has Highest Boiling point ?
(A) CH₃CH₂CH₂CH₂OH
(B) CH₃OH
(C) CH₃CH₂CH₂OH
(D) CH₃CH₂OH

Answer

Ans – (A) CH₃CH₂CH₂CH₂OH

---

6. In the following which has Highest Boiling point ?
(A) CH₃Br
(B) CH₃I
(C) CH₃F
(D) CH₃Cl

Answer

Ans – (B) CH₃I

---

7. Maximum amount of a solid solute that can be dissolved in a given amount of a liquid solvent does not depend upon :
(A) Pressure
(B) Temperature
(C) Nature of solute
(D) Nature of solvent

Answer

Ans – (A) Pressure

---

8. Low concentration of O₂ in the blood of people living at high altitude is due to:
(A) Low Temperature
(B) Low Atmospheric Pressure
(C) High Atmospheric Pressure
(D) None of the above

Answer

Ans – (B) Low Atmospheric Pressure

---

9. The unit of ebullioscopic constant is:
(A) K kg mol^–1
(B) mol kg K^–1
(C) K mol kg^–1
(D) None of the above

Answer

Ans – (A) K kg mol^–1

---

10. Molarity of 900 gm of water is:
(A) 50 M
(B) 55.5 M
(C) 5 M
(D) None of these

Answer

Ans – (B) 55.5 M

---

11. The molality of pure water is:
(A) 20
(B) 18
(C) 10
(D) 55.5

Answer

Ans – (D) 55.5

---

12. In the following strongest acid is: Most Important
(A) HCIO
(B) HClO₃
(C) HCIO₄
(D) HCIO₂

Answer

Ans – (C) HCIO₄

---

13. Isotonic solutions are the solutions having same : Most Important
(A) Concentration
(B) Osmotic pressure
(C) Surface tension
(D) Viscosity

Answer

Ans – (B) Osmotic pressure

---

14. Molal elevation constant is also called as:
(A) Cryoscopic constant
(B) Gas constant
(C) Ebullioscopic constant
(D) Freezing point depression constant

Answer

Ans – (C) Ebullioscopic constant

---

15. Which of the following has highest value of Van’t Hoff factor?
(A) 0.1 M Al₂(SO₄)₃
(B) 0.1 M C₆H₁₂O₆
(C) 0.1 M K₂SO₄
(D) 0.1 M NaCl

Answer

Ans – (A) 0.1 M Al₂(SO₄)₃

---

16. Symbol for Cryoscopic constant is:
(A) P⁰
(B) Kb
(C) K_f
(D) None of these

Answer

Ans – (C) K_f

---

17. What is the value of Van’t Hoff factor (i) for K₄[Fe(CN)₆] ?
(A) 6
(B) 5
(C) 4
(D) Zero

Answer

Ans – (B) 5

---

18. Which is most Basic ?
(A) PH₃
(B) SbH₃
(C) NH₃
(D) ASH₃

Answer

Ans – (C) NH₃

---

19. What is the value of Van’t Hoff factor (i) for dilute solution of Al₂(SO₄)₃ ?
(A) 3
(B) 2
(C) 5
(D) 6

Answer

Ans – (C) 5

---

20. In which Bond Angle is maximum ?
(A) H₂Sc
(B) H₂O
(C) H₂S
(D) H₂Te

Answer

Ans – (B) H₂O

---

21. Which is independent of temperature?
(A) Molality
(B) Normality
(C) Molarity
(D) Volume %

Answer

Ans – (C) Molarity

---

HBSE Class 12 Chemistry Chapter 2 – Electrochemistry MCQ Important Question Answer 2024

---

1. Conductance of an electrolytic solution depends:
(A) Nature of electrolyte
(B) Power of AC source
(C) Distance between two electrodes
(D) None of the above

Answer

Ans – (A) Nature of electrolyte

---

2. The metal that cannot be obtained by electrolysis of an aqueous solution of its salt is:
(A) Ca
(B) Ag
(C) Cr
(D) Cu

Answer

Ans – (A) Ca

---

3. Rust is mixture of :
(A) Fe₂O₃
(B) Fe₂O₃ and Fe(OH)₃
(C) FeO and Fe(OH)₃
(D) Fe₃O₄ and Fe(OH)₃

Answer

Ans – (B) Fe₂O₃ and Fe(OH)₃

---

4. The quantity of charge required to obtain 1 mol of Al from Al₂O₃.
(A) 1 F
(B) 6 F
(C) 3 F
(D) 2 F

Answer

Ans – (C) 3 F

---

5. Which of following statement is correct?
(A) Electrolysis of dil NaOH gives H₂ at cathode & O₂ at anode.
(B) Electrolysis of H₂SO₄ gives H₂ at cathode & O₂ at anode.
(C) Electrolysis of aq KF solution gives F₂ at cathode.
(D) None of the above.

Answer

Ans – (B) Electrolysis of H₂SO₄ gives H₂ at cathode & O₂ at anode.

---

6. Graphite is a good conductor of electricity due to the presence of:
(A) Lone pair of electron
(B) Free valence electron
(C) Cations
(D) Anions

Answer

Ans – (B) Free valence electron

---

7. For the given cell reaction: Mg | Mg²⁺ || Cu²⁺ | Cu Most Important
(A) Mg as Cathode
(B) Cu as Cathode.
(C) Cu is oxidizing agent
(D) None of the above

Answer

Ans – (B) Cu as Cathode.

---

8. For the given cell reaction: Cu | Cu²⁺ || Ag⁺ | Ag
(A) Cu as cathode
(B) Ag as cathode
(C) Ag as oxidising agent
(D) None of the above

Answer

Ans – (B) Ag as cathode

---

9. Number of Faradays (F) required to reduce 1 mole of MnO₄^– into Mn²⁺. Most Important
(A) 5F
(B) 2F
(C) 1F
(D) 7F

Answer

Ans – (A) 5F

---

10. The SI Units of molar conductivity are:
(A) Sm^-1mol^-1
(B) Sm³mol^-1
(C) Sm^-2mol
(D) Sm²mol^-1

Answer

Ans – (D) Sm²mol^-1

---

11. Standard Electrode potential for Standard Hydrogen Electrode (SHE) is: Most Important
(A) 0.5 V
(B) + 1.0 V
(C) 0.0 V
(D) + 2.0 V

Answer

Ans – (C) 0.0 V

---

12. Fused NaCl on electrolysis gives on Cathode is:
(A) Chlorine
(B) Sodium
(C) Sodium Amalgam
(D) Hydrogen

Answer

Ans – (B) Sodium

---

13. In dry cell which of the following is the Electrolyte ?
(A) Potassium hydroxide
(B) Sulphuric acid
(C) Ammonium chloride
(D) Manganese dioxide

Answer

Ans – (D) Manganese dioxide

---

HBSE Class 12 Chemistry Chapter 3 – Chemical Kinetics MCQ Important Question Answer 2024

---

1. Role of a catalyst is to change:
(A) Gibbs energy of reaction
(B) Enthalpy of reaction
(C) Activation energy of reaction
(D) None of the above

Answer

Ans – (C) Activation energy of reaction

---

2. Unit of rate constant for a Zero order reaction is:
(A) mol L^–1 s^–1
(B) L mol^–1 s^–1
(C) L² mol^–2 s^–1
(D) s^–1

Answer

Ans – (A) mol L^–1 s^–1

---

3. Time required for 100% completion of a Zero order reaction is:
(A) t_100% = a/k
(B) t_100% = a.k
(C) t_100% = a/2k
(D) None of these

Answer

Ans – (A) t_100% = a/k

---

4. Arrhenius equation is represented by:
(A) K = Ae^Ea/RT
(B) K = Ae^–Ea/RT
(C) t_1/2 = 0.693/K
(D) None of the above

Answer

Ans – (B) K = Ae^–Ea/RT

---

5. During decomposition of an activated complex:
(A) Energy is always released
(B) Energy is always absorbed
(C) Energy does not change
(D) None of the above

Answer

Ans – (B) Energy is always absorbed

---

6. Identify the order of reaction from given rate constant K = 2.6×10^–4 mol L^–1S^–1.
(A) First
(B) Zero
(C) Second
(D) None of these

Answer

Ans – (B) Zero

---

7. A catalyst increases the rate of reaction, then what will be the effect on rate constant ?
(A) Increases
(B) Decreases
(C) Not Changed
(D) None of these

Answer

Ans – (A) Increases

---

8. If rate constant for a Reaction is mole litre^–1 second^–1 then order of reaction is:
(A) Zero order
(B) First order
(C) Second order
(D) None of these

Answer

Ans – (A) Zero order

---

9. Identify the order of Reaction from the given rate constant K = 2.6×10^–4 L Mol^–1S^–1 Most Important
(A) First
(B) Zero
(C) Second
(D) None of these

Answer

Ans – (C) Second

---

10. For a Reaction N₂ + 3H₂ → 2NH₃ the rate of reaction with respect to NH₃ will be?

Answer

Ans – (C)

---

11. If Half life period of a first order reaction is 100 Seconds. There rate constant will be:
(A) 6.93 x 10^-3 Second
(B) 6.93 x 10^-2 Second
(C) .693 Second
(D) 6.93 Second

Answer

Ans – (A) 6.93 x 10^-3 Second

---

12. Half-life period of a first order reaction depends upon :
(A) Concentration of reactants
(B) Concentration of products
(C) Rate constant of reaction
(D) None of these

Answer

Ans – (C) Rate constant of reaction

---

13. The units of rate constant for first order reaction is: Most Important
(A) Time^-1
(B) Concentration^-1 Time^-1
(C) Concentration² Time^-2
(D) None of these

Answer

Ans – (A) Time^-1

---

14. An example of Zero Order Reaction is:
(A) Thermal decomposition of HI on gold surface
(B) Hydrogenation of ethene
(C) Decomposition of N₂O₅
(D) Inversion of Sucrose

Answer

Ans – (A) Thermal decomposition of HI on gold surface

---

15. If rate of a reaction is independent of the concentration of reactants, then reaction is:
(A) Zero order
(B) First order
(C) Second order
(D) None of these

Answer

Ans – (A) Zero order

---

16. Rate constant for a reaction is Rate = K[A]² [B]^-3/2 the order of reaction is:
(A) 3.0
(B) 0.5
(C) 1
(D) -0.5

Answer

Ans – (B) 0.5

---

17. Identify the order of reaction from the given rate constant: K = 1.6 x 10^-6 L mol^-1S^-1 Most Important
(A) Zero
(B) First
(C) Second
(D) None of these

Answer

Ans – (C) Second

---

18. A reaction is second order with respect to reactant. How is rate of reaction affected if concentration of reactant is reduced to half?
(A) 4 times
(B) 2 times
(C) 1/4 times
(D) 8 times

Answer

Ans – (C) 1/4 times

---

19. A reaction is second order with respect to reactant. How is rate of reaction affected ? If concentration of reactant is doubled ?
(A) 2 times
(B) 4 times
(C) 8 times
(D) 1/4 times

Answer

Ans – (B) 4 times

---

20. A reaction is first order in A and second order in B. Write the rate law equation:
(A) Rate = K [A]² [B]¹
(B) Rate = K [A]¹ [B]¹
(C) Rate = K [A]¹ [B]²
(D) Rate = K [A]² [B]²

Answer

Ans – (C) Rate = K [A]¹ [B]²

---

HBSE Class 12 Chemistry Chapter 4 – The d and F block Elements MCQ Important Question Answer 2024

---

1. In the following strongest reducing agent is: Most Important
(A) PH₃
(B) BiH₃
(C) SbH₃
(D) AsH₃

Answer

Ans – (B) BiH₃

---

2. Which of the following ion is colourless in aqueous solution?
(A) Fe²⁺
(B) Mn²⁺
(C) Ti³⁺
(D) Sc³⁺

Answer

Ans – (D) Sc³⁺

---

3. Which one is coloured ?
(A) Cu₂Cl₂
(B) [Sc(H₂O)₆]³⁺
(C) [Zn(H₂O)₆]²⁺
(D) [Ti(H₂O)₆]³⁺

Answer

Ans – (D) [Ti(H₂O)₆]³⁺

---

4. Which element does not show variable oxidation state ?
(A) Sc
(B) V
(C) Fe
(D) Hg

Answer

Ans – (A) Sc

---

5. Which of the following oxidation state is most common among the lanthanoids ?
(A) +4
(B) +3
(C) +2
(D) +5

Answer

Ans – (B) +3

---

6. The oxidation number of Cobalt in K[Co(CO)₄] is
(A) +1
(B) -1
(C) +3
(D) -3

Answer

Ans – (B) -1

---

7. Which one is coloured?
(A) [Ti(H₂O)₆]³⁺
(B) Cu₂I₂
(C) [Sc(H₂O)₆]³⁺
(D) [Zn (NH₃)₆]²⁺

Answer

Ans – (A) [Ti(H₂O)₆]³⁺

---

8. Haber’s process is used to prepare:
(A) H₂SO₄
(B) NH₃
(C) HCI
(D) O₃

Answer

Ans – (B) NH₃

---

9. What is the magnetic moment of Sc³⁺ ion ?
(A) 1.73 BM
(B) 0 BM
(C) 5.92 BM
(D) 2.83 BM

Answer

Ans – (B) 0 BM

---

10. Number of Unpaired Electrons in Ni²⁺ are:
(A) 0
(B) 2
(C) 8
(D) 4

Answer

Ans – (B) 2

---

11. Oxidation number of Pt in K₂[PtCl₆] is:
(A) +6
(B) +2
(C) +4
(D) Zero

Answer

Ans – (C) +4

---

12. What is the magnetic moment of [NiCl₄]^2- complex?
(A) 2.82 BM
(B) 1.82 BM
(C) 5.92 BM
(D) 1.41 BM

Answer

Ans – (A) 2.82 BM

---

HBSE Class 12 Chemistry Chapter 5 – Coordination Compounds MCQ Important Question Answer 2024

---

1. Which complex exhibit geometrical isomerism?
(A) [MnBr₄]²⁺
(B) [Pt(NH₃)₃ CI]⁺
(C) [PtCl₂(P(C₂H₅)₃)₂]
(D) [Fe(H₂O)₅NO]²⁺

Answer

Ans – (C) [PtCl₂(P(C₂H₅)₃)₂]

---

2. What is the Co-ordination number in the [Co(NH₃)₆]Cl₃ Compound?
(A) 3
(B) 4
(C) 6
(D) 2

Answer

Ans – (C) 6

---

3. The Oxidation number of chromium in [Cr(H₂O)₆]Cl₃ is :
(A) +4
(B) +3
(C) –3
(D) +2

Answer

Ans – (B) +3

---

4. In the following chelating ligand is :
(A) OH^–
(B) H₂NCH₂CH₂NH₂
(C) Cl^–
(D) CN^–

Answer

Ans – (B) H₂NCH₂CH₂NH₂

---

5. What is the co-ordination number in the (Co(NH₃)₅ (CO₃)]Cl compound? Most Important
(A) 6
(B) 3
(C) 4
(D) 2

Answer

Ans – (B) 3

---

6. What is the coordination number in the K₃ [Cr (C₂O₄)₃] coordinate compound:
(A) 3
(B) 6
(C) 4
(D) 2

Answer

Ans – (B) 6

---

7. What is the co-ordination number of Cr in [Cr(en)₃]³⁺ complex ?
(A) 3
(B) 2
(C) 6
(D) 4

Answer

Ans – (C) 6

---

8. What is the co-ordination number of cobalt in the [CoCl₂(en)₂]Cl compound?
(A) 6
(B) 4
(C) 8
(D) 2

Answer

Ans – (A) 6

---

9. What is the co-ordination number of aluminium in K₃[Al(C₂O₄)₃] compound ?
(A) 3
(B) 4
(C) 2
(D) 6

Answer

Ans – (D) 6

---

10. What is the co-ordination number of platinum in [Pt(NH₃)₂Cl(NO₂)] compound?
(A) 4
(B) 8
(C) 6
(D) 2

Answer

Ans – (A) 4

---

11. Which type of Isomerism present in [Co(NH₃)₄Cl₂]NO₂ and [Co(NH₃)₄ClNO₂]Cl
(A) Ionic
(B) Linkage
(C) Optical
(D) Geometrical

Answer

Ans – (A) Ionic

---

12. In the following in which metal of complex ion has zero oxidation number?
(A) [Cr(H2O)6]³⁺
(B) [CuCl₄]^2-
(C) [Fe(CO)₅]
(D) [Fe(CN)₆]^3-

Answer

Ans – (C) [Fe(CO)₅]

---

13. What is hybridization of Ni in [NiCl₄]^2- ?
(A) sp³d
(B) dsp²
(C) sp³d²
(D) sp³

Answer

Ans – (D) sp³

---

14. What is relation between [Co(NH₃)₅CI]SO₄ and [Co(NH₃)₅SO₄]CI ?
(A) Linkage isomers
(B) Coordination isomers
(C) Ionisation isomers
(D) Solvate isomers

Answer

Ans – (C) Ionisation isomers

---

15. Which type of Isomerism present in [Cr(NH₃)Cl]Br and [Cr(NH₃)₅Br]Cl ?
(A) Linkage
(B) Geometrical
(C) Optical
(D) Ionic

Answer

Ans – (B) Geometrical

---

16. In the following complexes which metal has zero oxidation number ?
(A) [Fe(CN)₆]^3-
(B) [CuCl₄]^2-
(C) [Ni(CO)₄]
(D) K₄[Fe(CN)₆]

Answer

Ans – (C) [Ni(CO)₄]

---

17. In the following which is strongest Ligand?
(A) OH^–
(B) NCS^–
(C) CN^–
(D) CO

Answer

Ans – (C) CN^–

---

18. Which Element will show highest oxidation number ?
(A) Cr
(B) Mn
(C) Fe
(D) Zn

Answer

Ans – (B) Mn

---

19. Which is Ambidentate Ligand ? Most Important
(A) CO₃^2-
(B) CN
(C) NO₃^–
(D) Br

Answer

Ans – (A) CO₃^2-

---

20. The oxidation number of Cr in [Cr(NH₃)₄Cl₂]Cl is:
(A) +6
(B) +1
(C) +3
(D) Zero

Answer

Ans – (C) +3

---

HBSE Class 12 Chemistry Chapter 6 – Haloalkanes and Haloarenes MCQ Important Question Answer 2024

---

1. The ease of dehydrohalogenation of alkyl halides with alcoholic KOH is:
(A) 3° < 2° <1°
(B) 3° > 2° > 1°
(C) 3° < 2° > 1°
(D) None of these

Answer

Ans – (B) 3° > 2° > 1°

---

2. A 1° alkyl halide would prefer to undergo :
(A) SN²
(B) SN¹
(C) Elimination
(D) None of these

Answer

Ans – (A) SN²

---

3. Copper sulphate dissolves in excess of KCN to give :
(A) [Cu(CN)₄]^3–
(B) [Cu(CN)₄]^2–
(C) CuCN
(D) [Cu(CN)₂]

Answer

Ans – (D) [Cu(CN)₂]

---

4. Organic compound which shows complete stereochemical inversion during SN² reaction : Most Important
(A) CH₃Cl
(B) (CH₃)₂CH–Cl
(C) (CH₃)₃C–Cl
(D) None of the above

Answer

Ans – (A) CH₃Cl

---

5. Which Metal has highest density?
(A) Pt
(C) W
(B) Os
(D) Hg

Answer

Ans – (B) Os

---

6. SN² reaction will be fastest in :
(A) CH₃Br
(B) CH₃Cl
(C) CH₃CH₂Cl
(D) (CH₃)₂CHCl

Answer

Ans – (A) CH₃Br

---

7. C₆H₅Cl + CH₃CI + 2NO This reaction is:
(A) Staphen
(B) Sendmeyer’s
(C) Fittig
(D) Wurtz-Fitting

Answer

Ans – (D) Wurtz-Fitting

---

8. Which of the following organic compounds are formed by Wurtz reaction?
(A) Alcohols
(B) Hydrocarbons
(C) Haloalkanes
(D) Haloarenes

Answer

Ans – (B) Hydrocarbons

---

9. A primary alkyl halide would prefer to undergo : Most Important
(A) S_N2
(B) S_N1
(C) Elimination
(D) None of these

Answer

Ans – (A) S_N2

---

10. CH₃Cl A P, P is :
(A) CH₃CH₂Cl
(B) CH₃CH₂NH₂
(C) C₂H₅CN
(D) C₃H₈

Answer

Ans – (B) CH₃CH₂NH₂

---

11. Which one of the following has the highest dipole moment ? Most Important
(A) CHCl₃
(B) CH₃Cl
(C) CH₂Cl₂
(D) CCl₄

Answer

Ans – (C) CH₂Cl₂

---

HBSE Class 12 Chemistry Chapter 7 – Alcohols, Phenols and Ethers MCQ Important Question Answer 2024

---

1. Acid anhydrides on reaction with 1° amine gives:
(A) Amide
(B) Imide
(D) None of these
(C) Imine

Answer

Ans – (A) Amide

---

2. Alkyl halides are prepared from alcohol by treating with:
(A) HCI + ZnCl₂
(B) H₂SO₄ + KI
(C) NaCl + H₂SO₄
(D) None of the above

Answer

Ans – (A) HCI + ZnCl₂

---

3. Molecular formula of Ethers is: Most Important
(A) C_nH_2n+1O
(B) C_nH_2nO
(C) C_nH_2n+2O
(D) None of the above

Answer

Ans – (C) C_nH_2n+2O

---

4. Which of the following is most acidic ? Most Important
(A) Benzyl alcohol
(B) Cyclohexanol
(C) Phenol
(D) m-chlorophenol

Answer

Ans – (D) m-chlorophenol

---

5. Williamson Synthesis is used to prepare: Most Important
(A) Alcohol
(B) Amine
(C) Ketone
(D) Ether

Answer

Ans – (D) Ether

---

6. In the reaction A + B   A and B are :
(A) C₆H₅I, CH₃OH
(B) C₆H₅OH, CH₃I
(C) C₆H₅CH₂OH, CH₃I
(D) CH₃CH₂I, C₆H₅OH

Answer

Ans – (B) C₆H₅OH, CH₃I

---

7. Which is weakest acid in the following?
(A) CH₃OH
(B) (CH₃)₂CHOH
(C) CH₃CH₃OH
(D) (CH₃)₃COH

Answer

Ans – (D) (CH₃)₃COH

---

8. CH₃CH₂OH A’, A’ will be : Most Important
(A) CH₂=CH₂
(B) C₂H₅OCH₃
(C) (C₂H₅)₂O
(D) CH₃CH₂CH₂CH₃

Answer

Ans – (A) CH₂=CH₂

---

9. Anisole with Hi at 373 K temperature will give :
(A) C₆H₅I + CH₃OH
(B) C₆H₅OH + CH₃I
(C) C₆H₅CH₂OH + CH₃I
(D) CH₃CH₂I + C₆H₅OH

Answer

Ans – (B) C₆H₅OH + CH₃I

---

10. Arrange the following in order of increasing their Acidic strength:
(A) CH₃OH
(B) C₂H₅OH
(C) Phenol
(D) p- Nitrophenol

Answer

Ans – (D) p- Nitrophenol

---

11. CH₃-CH₂-OH X what is X? Most Important
(A) CH₂ = CH₂
(B) C₂H₅ – O – C₂H₅
(C) CH₃ – O – CH₂ – CH₃
(D) CH₃CH₂HSO

Answer

Ans – (A) CH₂ = CH₂

---

12. In the preparation of alkyl halide from alcohol which of the following reagent is preferred?
(A) HX + ZnCl₂
(B) PX₃
(C) PCl₅
(D) SO₂Cl₂

Answer

Ans – (C) PCl₅

---

13. Which is strongest acid in the following ? Most Important
(A) CH₃OH
(B) CH₃CH₂OH
(C) (CH₃)₂CHOH
(D) (CH₃)₃COH

Answer

Ans – (A) CH₃OH

---

14. Which one is the strongest acid ?
(A) Ethanol
(B) Phenol
(C) Methanol
(D) p-Nitrophenol

Answer

Ans – (D) p-Nitrophenol

---

15. C₂H₅OC₂H₅ + HI → A + B, A and B are:
(A) C₂H₅OH, C₂H₅I
(B) C₂H₅OH, CH₃I
(C) C₂H₅CHO + CH₃I
(D) C₂H₅I, CH₃OH

Answer

Ans – (A) C₂H₅OH, C₂H₅I

---

16. Reaction of Benzene diazonium chloride with ethanol will give :
(A) Benzene
(B) Benzamide
(C) Benzenamine.
(D) Phenol

Answer

Ans – (A) Benzene

---

17. Which is Least Acidic ?
(A) C₂H₅OH
(B) CH₃COOH
(C) C₆H₅OH
(D) CICH₂COOH

Answer

Ans – (A) C₂H₅OH

---

18. In the reaction C₆H₅OCH₃ + HI A+B, A and B are
(A) C₆H₅I, CH₃OH
(B) C₆H₅OH, CH₃I
(C) C₆H₅CH₂OH, CH₃I
(D) CH₃CH₂I, C₆H₅OH

Answer

Ans – (B) C₆H₅OH, CH₃I

---

19. A tertiary alkyl halide would prefer to undergo :
(A) S_N²
(B) Elimination
(C) Addition
(D) S_N¹

Answer

Ans – (B) Elimination

---

HBSE Class 12 Chemistry Chapter 8 – Aldehydes, Ketones and Carboxylic Acids MCQ Important Question Answer 2024

---

1. Which on heating with aqueous KOH, produces acetaldehyde ?
(A) CH₃ — CH — Cl₂
(B) CH₃ — CO — Cl
(C) CH₃ — CH₂ — Cl
(D) CH₃ — Cl — CH₂ — Cl

Answer

Ans – (A) CH₃ — CH — Cl₂

---

2. lodoform test is not given by: Most Important
(A) 2-Pentanone
(B) 3-Pentanone
(C) Ethanol
(D) Ethanal

Answer

Ans – (B) 3-Pentanone

---

3. IUPAC name of Acetic acid is: Most Important
(A) Methanal
(B) 2- Pentanone
(C) Ethanoic acid
(D) Methanoic acid

Answer

Ans – (C) Ethanoic acid

---

4. Which metal carbonyl has the strongest C-O bond?
(A) Mn(CO)₆⁺
(B) Cr(CO)₆
(C) V(CO)₆
(D) Fe(CO)₅

Answer

Ans – (A) Mn(CO)₆⁺

---

5. A strong base can abstract an α-hydrogen from:
(A) Ketone
(C) Alkene
(B) Alkane
(D) Amine

Answer

Ans – (A) Ketone

---

6. In the following strongest acid is:
(A) CH₃CH₂COOH
(B) CH₃COOH
(C) C₆H₅COOH
(D) C₆H₅CH₂COOH

Answer

Ans – (C) C₆H₅COOH

---

7. What type of organic compound are prepared by Gatterman-Koch reaction?
(A) Aliphatic Aldehyde
(B) Aromatic Ketone
(C) Aliphatic Ketone
(D) Aromatic Aldehyde

Answer

Ans – (D) Aromatic Aldehyde

---

8. , this reaction is:
(A) Etard reaction
(B) HVZ reaction
(C) Rosenmund reduction
(D) Gatterman reaction

Answer

Ans – (C) Rosenmund reduction

---

9. Aldehydes and Ketones can be distinguished by:
(A) Conc. H₂SO₄
(B) Anhyd. ZnCl₂
(C) Tollens’ Reagent
(D) Conc. HCL

Answer

Ans – (C) Tollens’ Reagent

---

10. Which is the strongest acid ?
(A) CH₃COOH
(B) CH₃CH₂COOH
(C) CICH₂COOH
(D) FCH₂COOH

Answer

Ans – (D) FCH₂COOH

---

11. In the following reaction, product P is, P :

Answer

Ans – (B)

---

HBSE Class 12 Chemistry Chapter 9 – Amines MCQ Important Question Answer 2024

---

1.Hoffman Bromamide degradation reaction involve :
(A) Ar–NH₂
(B) Ar–CONH₂
(C) Ar–NO₂
(D) None of these

Answer

Ans – (B) Ar–CONH₂

---

2. Which of the following is a 3° amine?
(A) Methylamine
(B) Triethyl amine
(C) Ethylamine
(D) t-butylamine

Answer

Ans – (B) Triethyl amine

---

3. Hoffmann Bromamide degradation reaction form:
(A) Ar – CONΗ₂
(B) Ar – NO₂
(C) Ar – NH₂
(D) Ar – OH

Answer

Ans – (C) Ar – NH₂

---

4. What is the name of this reaction? ArN₂⁺X^–   ArCl + N₂ + CuX
(A) Coupling reaction.
(B) Balz-Schiemann Reaction
(C) Gattermann reaction
(D) Sendmeyer reaction

Answer

Ans – (C) Gattermann reaction

---

5. CH₃CONH₂ P, P is:
(A) CH₃CN
(B) CH₃NH₂
(C) CH₃Br
(D) CH₃OH

Answer

Ans – (B) CH₃NH₂

---

6. C₂H₃NH + CHCl₃ + KOH P, P is:
(A) C₂H₅Cl
(B) C₂H₅OH
(C) C₂H₅NC
(D) C₂H₅NHCH₃

Answer

Ans – (A) C₂H₅Cl

---

7. Hofmann bromamide degradation reaction involve :
(A) C₆H₅NH₂
(B) C₆H₅COΝΗ₂
(C) C₆H₅NO₂
(D) C₆H₅OH

Answer

Ans – (B) C₆H₅COΝΗ₂

---

8. Which is a tertiary amine?
(A) t-butylamine
(B) Ethylamine
(C) N-Methylethylamine
(D) Triethylamine

Answer

Ans – (D) Triethylamine

---

9. ; what is X?

Answer

Ans – (B)

---

10. Which of the following is most acidic ?

Answer

Ans – (A)

---

11. , P is:

Answer

Ans – (A)

---

HBSE Class 12 Chemistry Chapter 10 – Biomolecules MCQ Important Question Answer 2024

---

1. Which of the following is stored in liver of animals ?
(A) Amylose
(B) Cellulose
(C) Amylopectin
(D) Glycogen

Answer

Ans – (D) Glycogen

---

2. Which base is present in DNA but not in RNA ? Most Important
(A) Thyamine
(B) Cytosine
(C) Uracil
(D) Guanine

Answer

Ans – (C) Uracil

---

3. In the following which is not a Monosaccharide sugar?
(A) Glucose
(B) Fructose
(C) Mannose
(D) Maltose

Answer

Ans – (D) Maltose

---

4. Which Vitamin is soluble in water?
(A) Vitamin D
(B) Vitamin K
(C) Vitamin E
(D) Vitamin B

Answer

Ans – (D) Vitamin B

---

5. Riboflavin is:
(A) Vitamin B
(B) Vitamin A
(C) Vitamin C
(D) Vitamin D

Answer

Ans – (A) Vitamin B

---

6. Vitamin B₁ is known as:
(A) Ascorbic acid
(B) Thiamine
(C) Riboflavin
(D) Pyridoxine

Answer

Ans – (B) Thiamine

---

7. The Vitamin responsible for the coagulation of blood is :
(A) Vitamin B₁
(B) Vitamin D
(C) Vitamin K
(D) Vitamin C

Answer

Ans – (C) Vitamin K

---

8. Glycogen is an example of:
(A) Polysaccharide
(B) Disaccharide
(C) Monosaccharide
(D) Protein

Answer

Ans – (A) Polysaccharide

---

9. Which of the following amino acids is not optically active ? Most Important
(A) Alanine
(B) Glycine
(C) Valine
(D) Leucine

Answer

Ans – (B) Glycine

---

10. The Vitamin responsible for the coagulation of blood is :
(A) Vitamin C
(B) Vitamin D
(C) Vitamin B₁
(D) Vitamin K

Answer

Ans – (D) Vitamin K

---

11. Disaccharide is:
(A) Starch
(B) Fructose
(C) Lactose
(D) Cellulose

Answer

Ans – (C) Lactose

---

12. Enzymes are:
(A) Nucleic acids
(B) Fats
(C) Carbohydrates
(D) Proteins

Answer

Ans – (D) Proteins

---

13. Glycogen is an example of:
(A) Protein
(B) Polysaccharide
(C) Monosaccharide
(D) Disaccharide

Answer

Ans – (B) Polysaccharide

---