HBSE Class 12 Chemistry MCQ Important Question Answer 2026

Most of students search over Google for Haryana Board (HBSE) Important Questions 2026. Here is the Main reason because HBSE Board Says that in HBSE Exam 2026 (last 3 Years of Questions will Repeat) so that here are the selected List of Questions of Haryana Board For Class 12.

HBSE Class 12 Chemistry MCQ Important Question Answer 2026

Chapter 1 – Solutions

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

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

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

Ans – (D) H₂S

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

Ans – (A) C₂H₅F

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

Ans – (A) CH₃CH₂CH₂CH₂OH

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

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

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

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

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

Ans – (B) 55.5 M

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

Ans – (D) 55.5

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

Ans – (C) HCIO₄

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

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

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

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

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

Ans – (B) 5

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

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

Ans – (C) 5

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

Ans – (B) H₂O

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

Ans – (C) Molarity

Chapter 2 – Electrochemistry

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

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

Ans – (A) Ca

3. Rust is mixture of :
(A) Fe₂O₃
(B) Fe₂O₃and Fe(OH)₃
(C) FeO and Fe(OH)₃
(D) Fe₃O₄ and Fe(OH)₃

Ans – (B) Fe₂O₃and 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

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.

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

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

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

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

Ans – (A) 5F

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

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

Ans – (C) 0.0 V

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

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

Ans – (D) Manganese dioxide

Chapter 3 – Chemical Kinetics

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

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^–1s^–1
(C) L² mol^–2 s^–1
(D) s^–1

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

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

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

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

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

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

Ans – (A) Zero order

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

Ans – (C) Second

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

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^-3Second
(B) 6.93 x 10^-2Second
(C) .693 Second
(D) 6.93 Second

Ans – (A) 6.93 x 10^-3Second

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

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

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

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

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

Ans – (B) 0.5

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

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

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

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

Ans – (C) Rate = K [A]¹ [B]²

Chapter 4 – The d and F block Elements

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

Ans – (B) BiH₃

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

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⁺

Ans – (D) [Ti(H₂O)₆]³⁺

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

Ans – (A) Sc

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

Ans – (B) +3

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

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⁺

Ans – (A) [Ti(H₂O)₆]³⁺

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

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

Ans – (B) 0 BM

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

Ans – (B) 2

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

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

Ans – (A) 2.82 BM

Chapter 5 – Coordination Compounds

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⁺

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

Ans – (C) 6

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

Ans – (B) +3

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

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

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

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

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

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

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

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

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-

Ans – (C) [Fe(CO)₅]

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

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

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

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]

Ans – (C) [Ni(CO)₄]

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

Ans – (C) CN^–

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

Ans – (B) Mn

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

Ans – (A) CO₃^2-

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

Ans – (C) +3

Chapter 6 – Haloalkanes and Haloarenes

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

Ans – (B) 3° > 2° > 1°

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

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]

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

Ans – (A) CH₃Cl

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

Ans – (B) Os

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

Ans – (A) CH₃Br

7. C₆H₅Cl + CH₃CI + 2NO $\displaystyle \xrightarrow{{DryEther}}$ This reaction is:
(A) Staphen
(B) Sendmeyer’s
(C) Fittig
(D) Wurtz-Fitting

Ans – (D) Wurtz-Fitting

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

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

Ans – (A) S_N2

10. CH₃Cl $\displaystyle \xrightarrow{{KCN}}$ A $\displaystyle \xrightarrow{{\text{Na/C2H5OH}}}$ P, P is :
(A) CH₃CH₂Cl
(B) CH₃CH₂NH₂
(C) C₂H₅CN
(D) C₃H₈

Ans – (B) CH₃CH₂NH₂

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

Ans – (C) CH₂Cl₂

Chapter 7 – Alcohols, Phenols and Ethers

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

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

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

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

Ans – (D) m-chlorophenol

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

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

Ans – (B) C₆H₅OH, CH₃I

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

Ans – (D) (CH₃)₃COH

8. CH₃CH₂OH $\displaystyle \xrightarrow[{413K}]{{Con.H2SO4}}$ A’, A’ will be : Most Important
(A) CH₂=CH₂
(B) C₂H₅OCH₃
(C) (C₂H₅)₂O
(D) CH₃CH₂CH₂CH₃

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

Ans – (B) C₆H₅OH + CH₃I

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

Ans – (D) p- Nitrophenol

11. CH₃-CH₂-OH $\displaystyle \xrightarrow[{413K}]{{H2SO4}}$ X what is X? Most Important
(A) CH₂ = CH₂
(B) C₂H₅ – O – C₂H₅
(C) CH₃ – O – CH₂ – CH₃
(D) CH₃CH₂HSO

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

Ans – (C) PCl₅

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

Ans – (A) CH₃OH

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

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

Ans – (A) C₂H₅OH, C₂H₅I

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

Ans – (A) Benzene

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

Ans – (A) C₂H₅OH

18. In the reaction C₆H₅OCH₃ + HI $\displaystyle \xrightarrow{{373K}}$ A+B, A and B are
(A) C₆H₅I, CH₃OH
(B) C₆H₅OH, CH₃I
(C) C₆H₅CH₂OH, CH₃I
(D) CH₃CH₂I, C₆H₅OH

Ans – (B) C₆H₅OH, CH₃I

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

Ans – (B) Elimination

Chapter 8 – Aldehydes, Ketones and Carboxylic Acids

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

Ans – (A) CH₃ — CH — Cl₂

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

Ans – (B) 3-Pentanone

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

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

Ans – (A) Mn(CO)₆⁺

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

Ans – (A) Ketone

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

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

Ans – (D) Aromatic Aldehyde

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

Ans – (C) Rosenmund reduction

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

Ans – (C) Tollens’ Reagent

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

Ans – (D) FCH₂COOH

Chapter 9 – Amines

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

Ans – (B) Ar–CONH₂

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

Ans – (B) Triethyl amine

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

Ans – (C) Ar – NH₂

4. What is the name of this reaction? ArN₂⁺X^– $\displaystyle \xrightarrow{{\text{Cu/HCl}}}$ ArCl + N₂ + CuX
(A) Coupling reaction.
(B) Balz-Schiemann Reaction
(C) Gattermann reaction
(D) Sendmeyer reaction

Ans – (C) Gattermann reaction

5. CH₃CONH₂ $\displaystyle \xrightarrow{{\text{B}{{\text{r}}_{\text{2}}}\text{/KOH}}}$ P, P is:
(A) CH₃CN
(B) CH₃NH₂
(C) CH₃Br
(D) CH₃OH

Ans – (B) CH₃NH₂

6. C₂H₃NH + CHCl₃ + KOH $\displaystyle \xrightarrow{\Delta }$ P, P is:
(A) C₂H₅Cl
(B) C₂H₅OH
(C) C₂H₅NC
(D) C₂H₅NHCH₃

Ans – (A) C₂H₅Cl

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

Ans – (B) C₆H₅COΝΗ₂

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

Ans – (D) Triethylamine

Chapter 10 – Biomolecules

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

Ans – (D) Glycogen

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

Ans – (C) Uracil

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

Ans – (D) Maltose

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

Ans – (D) Vitamin B

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

Ans – (A) Vitamin B

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

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

Ans – (C) Vitamin K

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

Ans – (A) Polysaccharide

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

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

Ans – (D) Vitamin K

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

Ans – (C) Lactose

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

Ans – (D) Proteins

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

Ans – (B) Polysaccharide

CCL Chapter