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Amines CBSE Class 12 MCQ & Practice Questions

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Amines Revision Guide for CBSE Class 12 Chemistry

Amines is part of CBSE Class 12 Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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Important Topics

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  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

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What to practise in Amines

Concept Revision

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Exam-style MCQs

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Top 20 Amines MCQs with Answers

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CBSE Class 12 Chemistry · Amines · Very Very Hard

1. The functional group of primary amines is:

  • A. –NH₂
  • B. –CONH₂
  • C. –NO₂
  • D. –CN
Answer: A
Explanation: Primary amines contain the amino group –NH₂ attached to one carbon group.

CBSE Class 12 Chemistry · Amines · Very Very Hard

2. The IUPAC name of CH₃NH₂ is:

  • A. Methanamine
  • B. Methylamide
  • C. Methanimine
  • D. Aminomethane only
Answer: A
Explanation: CH₃NH₂ is named methanamine.

CBSE Class 12 Chemistry · Amines · Very Very Hard

3. Which compound is a secondary amine?

  • A. CH₃NH₂
  • B. (CH₃)₂NH
  • C. (CH₃)₃N
  • D. C₆H₅NH₂
Answer: B
Explanation: A secondary amine has two alkyl or aryl groups attached to nitrogen.

CBSE Class 12 Chemistry · Amines · Very Very Hard

4. Which compound is a tertiary amine?

  • A. NH₃
  • B. CH₃NH₂
  • C. (CH₃)₂NH
  • D. (CH₃)₃N
Answer: D
Explanation: A tertiary amine has three carbon groups attached to nitrogen.

CBSE Class 12 Chemistry · Amines · Very Very Hard

5. The basic character of amines is due to:

  • A. Positive charge on nitrogen
  • B. Lone pair on nitrogen
  • C. Presence of oxygen
  • D. Resonance in every amine
Answer: B
Explanation: The nitrogen lone pair can accept a proton.

CBSE Class 12 Chemistry · Amines · Very Very Hard

6. Which is generally more basic in aqueous solution?

  • A. Aniline
  • B. Methylamine
  • C. Nitrobenzene
  • D. Acetanilide
Answer: B
Explanation: The lone pair in methylamine is more available than in aniline, where it is delocalised into the ring.

CBSE Class 12 Chemistry · Amines · Very Very Hard

7. Aniline is less basic than ammonia because:

  • A. Its lone pair is delocalised into the benzene ring
  • B. It has no lone pair
  • C. It is ionic
  • D. It contains oxygen
Answer: A
Explanation: Resonance reduces the availability of nitrogen's lone pair for protonation.

CBSE Class 12 Chemistry · Amines · Very Very Hard

8. Electron-donating groups on aniline generally:

  • A. Decrease basicity
  • B. Increase basicity
  • C. Have no effect
  • D. Convert it into an acid
Answer: B
Explanation: Electron donation increases electron density on nitrogen and generally raises basicity.

CBSE Class 12 Chemistry · Amines · Very Very Hard

9. Electron-withdrawing groups on aniline generally:

  • A. Increase basicity
  • B. Decrease basicity
  • C. Have no effect
  • D. Cause hydrogenation
Answer: B
Explanation: Electron withdrawal makes the nitrogen lone pair less available.

CBSE Class 12 Chemistry · Amines · Very Very Hard

10. The Hinsberg reagent is:

  • A. Benzenesulfonyl chloride
  • B. Benzoyl chloride
  • C. Acetyl chloride
  • D. Nitrobenzene
Answer: A
Explanation: Benzenesulfonyl chloride is used to distinguish primary, secondary and tertiary amines.

CBSE Class 12 Chemistry · Amines · Very Very Hard

11. A primary amine in the Hinsberg test forms:

  • A. A sulfonamide soluble in alkali
  • B. A sulfonamide insoluble in alkali
  • C. No reaction
  • D. A diazonium salt directly
Answer: A
Explanation: The sulfonamide formed from a primary amine has an acidic N–H and dissolves in alkali.

CBSE Class 12 Chemistry · Amines · Very Very Hard

12. A secondary amine in the Hinsberg test forms:

  • A. A sulfonamide soluble in alkali
  • B. A sulfonamide insoluble in alkali
  • C. No reaction under any condition
  • D. An alcohol
Answer: B
Explanation: The product lacks an N–H proton and is insoluble in alkali.

CBSE Class 12 Chemistry · Amines · Very Very Hard

13. A tertiary amine in the Hinsberg test:

  • A. Forms an alkali-soluble sulfonamide
  • B. Forms an insoluble sulfonamide
  • C. Does not form a sulfonamide
  • D. Forms an amide
Answer: C
Explanation: Tertiary amines have no N–H bond and do not form sulfonamides.

CBSE Class 12 Chemistry · Amines · Very Very Hard

14. Carbylamine test is given by:

  • A. Primary amines
  • B. Secondary amines
  • C. Tertiary amines
  • D. Amides only
Answer: A
Explanation: Only primary amines form foul-smelling isocyanides with CHCl₃ and alcoholic KOH.

CBSE Class 12 Chemistry · Amines · Very Very Hard

15. The product of carbylamine reaction is:

  • A. Isocyanide
  • B. Nitrile
  • C. Amide
  • D. Diazonium salt
Answer: A
Explanation: Primary amines form isocyanides, R–NC.

CBSE Class 12 Chemistry · Amines · Very Very Hard

16. Aniline reacts with bromine water to form:

  • A. Bromobenzene
  • B. 2,4,6-Tribromoaniline
  • C. p-Bromoaniline only
  • D. No reaction
Answer: B
Explanation: The strongly activating –NH₂ group causes rapid tribromination.

CBSE Class 12 Chemistry · Amines · Very Very Hard

17. Aniline is protected by acetylation before controlled bromination because:

  • A. Acetylation reduces ring activation
  • B. Acetylation removes nitrogen
  • C. Acetylation makes it ionic
  • D. Acetylation destroys the ring
Answer: A
Explanation: Conversion to acetanilide moderates the activating effect of –NH₂.

CBSE Class 12 Chemistry · Amines · Very Very Hard

18. Diazotisation of aniline is carried out at:

  • A. 0–5°C
  • B. 25–30°C
  • C. 50–60°C
  • D. 100°C
Answer: A
Explanation: Benzenediazonium chloride is stable only at low temperature.

CBSE Class 12 Chemistry · Amines · Very Very Hard

19. Aniline reacts with NaNO₂ and HCl at 0–5°C to form:

  • A. Nitrobenzene
  • B. Benzenediazonium chloride
  • C. Phenol directly
  • D. Benzamide
Answer: B
Explanation: Nitrous acid generated in situ converts aniline to the diazonium salt.

CBSE Class 12 Chemistry · Amines · Very Very Hard

20. Benzenediazonium chloride on warming with water gives:

  • A. Benzene
  • B. Phenol
  • C. Chlorobenzene
  • D. Aniline
Answer: B
Explanation: Hydrolysis of the diazonium salt gives phenol and nitrogen gas.

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Amines

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Amines Frequently Asked Questions

How should I prepare Amines for CBSE Class 12 Chemistry?

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