CBSE Class 12 Chemistry Amines MCQs with Answers

Amines are an important topic in the CBSE Class 12 Chemistry syllabus, and having a good grip on this chapter is must for scoring higher marks in board as well as competitive exams like NEET Exam or JEE Exam. In this section, we provide MCQ of Amines Class 12 with Answers prepared according to NCERT solutions for Class 12 Chemistry so that students can revise quickly. Practicing amines MCQ helps to understand concepts like classification of amines, preparation methods, chemical properties and their uses in daily life.

The MCQ on Amines Class 12 are designed in such way that they cover both basic and tricky points from the chapter. Many students find this topic little confusing due to reactions and structures, but with these amines Class 12 MCQ and detailed explanations you can clear your doubts easily. We also provide amines Class 12 MCQ PDF so you can study offline. Whether you are searching for MCQ amines Class 12 for exam preparation or just want a quick test of your knowledge, this resource will be helpful.

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CBSE Class 12 Chemistry Amines MCQs with Answers

Here is a complete set of 50 MCQs on Amines Class 12 with answers and explanations, aligned with CBSE Class 12 Chemistry syllabus and NCERT solutions for class 12 chemistry.

Q1. Amines are derivatives of:

a) Alcohols

b) Ammonia

c) Carboxylic acids

d) Ketones

Answer: b) Ammonia

Explanation: Amines are derived by replacing one or more hydrogen atoms of ammonia (NH₃) with alkyl or aryl groups.

Q2. Which of the following is a secondary amine?

a) CH₃NH₂

b) (CH₃)₂NH

c) (CH₃)₃N

d) Aniline

Answer: b) (CH₃)₂NH

Explanation: Secondary amines have two alkyl groups attached to nitrogen.

Q3. The IUPAC name of CH₃–NH–CH₃ is:

a) Dimethylamine

b) Methylamine

c) Trimethylamine

d) Ethylamine

Answer: a) Dimethylamine

Explanation: Two methyl groups attached to nitrogen make it dimethylamine.

Q4. Which amine is also known as phenylamine?

a) Methylamine

b) Aniline

c) Ethylamine

d) Propylamine

Answer: b) Aniline

Explanation: C₆H₅NH₂ is called aniline or phenylamine.

Q5. Which functional group is present in amines?

a) –OH

b) –NH₂

c) –COOH

d) –CHO

Answer: b) –NH₂

Explanation: The amino group –NH₂ defines amines.

Q6. Which of the following is a tertiary amine?

a) (CH₃)₂NH

b) (CH₃)₃N

c) CH₃NH₂

d) C₆H₅NH₂

Answer: b) (CH₃)₃N

Explanation: Tertiary amines have three alkyl groups on nitrogen.

Q7. Which amine shows the strongest hydrogen bonding?

a) Primary amine

b) Secondary amine

c) Tertiary amine

d) All equal

Answer: a) Primary amine

Explanation: Primary amines have two hydrogens available for hydrogen bonding.

Q8. Among CH₃NH₂, (CH₃)₂NH, (CH₃)₃N, the most basic is:

a) CH₃NH₂

b) (CH₃)₂NH

c) (CH₃)₃N

d) All equal

Answer: b) (CH₃)₂NH

Explanation: In aqueous medium, secondary amine is most basic due to +I effect and availability of lone pair.

Q9. Aniline is less basic than methylamine because:

a) Resonance reduces electron density on N

b) Inductive effect increases electron density

c) Both are equally basic

d) Aniline is sterically hindered

Answer: a) Resonance reduces electron density on N

Explanation: In aniline, lone pair on nitrogen is delocalized with the benzene ring.

Q10. Which of the following amines is aromatic?

a) Methylamine

b) Dimethylamine

c) Aniline

d) Ethylamine

Answer: c) Aniline

Explanation: Aniline has an aryl group attached to nitrogen.

Q11. Carbylamine reaction is shown by:

a) Primary amines

b) Secondary amines

c) Tertiary amines

d) Aromatic amines only

Answer: a) Primary amines

Explanation: Only primary amines form isocyanides with chloroform + alkali.

Q12. The product formed when aniline reacts with bromine water is:

a) Nitroaniline

b) Tribromoaniline

c) Anisole

d) Phenol

Answer: b) Tribromoaniline

Explanation: Aniline reacts with Br₂ water to give white precipitate of 2,4,6-tribromoaniline.

Q13. Which reagent is used to convert amine to diazonium salt?

a) HCl + NaNO₂

b) HNO₃

c) SOCl₂

d) Br₂

Answer: a) HCl + NaNO₂

Explanation: Primary aromatic amine + nitrous acid at 273 K forms diazonium salt.

Q14. Hinsberg’s reagent is:

a) C₆H₅SO₂Cl

b) CHCl₃

c) HNO₃

d) NaOH

Answer: a) C₆H₅SO₂Cl

Explanation: Used to distinguish primary, secondary, tertiary amines.

Q15. Gabriel phthalimide synthesis is used to prepare:

a) Primary amines

b) Secondary amines

c) Tertiary amines

d) Aromatic amines

Answer: a) Primary amines

Explanation: It gives only primary amines.

Q16. Ammonolysis of alkyl halides gives:

a) Alcohols

b) Amines

c) Acids

d) Alkanes

Answer: b) Amines

Explanation: Alkyl halides react with ammonia to give amines.

Q17. Reduction of nitro compounds gives:

a) Alcohols

b) Amines

c) Carboxylic acids

d) Ketones

Answer: b) Amines

Explanation: Nitro group is reduced to amino group.

Q18. Hoffmann bromamide reaction gives:

a) Primary amine

b) Secondary amine

c) Amide

d) Nitro compound

Answer: a) Primary amine

Explanation: Amides react with Br₂ + NaOH to form primary amines with one carbon less.

Q19. Which one of the following is not a method of preparation of amines?

a) Hoffmann bromamide reaction

b) Gabriel synthesis

c) Reduction of nitro compounds

d) Aldol condensation

Answer: d) Aldol condensation

Explanation: Aldol is for aldehydes and ketones, not amines.

Q20. Which is the best method for preparing primary amines without isomers?

a) Gabriel phthalimide synthesis

b) Ammonolysis

c) Reduction of nitro compound

d) Hoffmann bromamide reaction

Answer: a) Gabriel phthalimide synthesis

Explanation: Gabriel method avoids formation of secondary or tertiary amines.

Q21. Benzene diazonium chloride is stable at:

a) 0–5°C

b) 25°C

c) 50°C

d) Room temperature

Answer: a) 0–5°C

Explanation: Diazonium salts decompose above 5°C.

Q22. Gattermann reaction involves replacement of diazonium group with:

a) –H

b) –Cl or –Br

c) –NO₂

d) –OH

Answer: b) –Cl or –Br

Explanation: Gattermann reaction replaces diazonium group with halogen using Cu/HX.

Q23. Sandmeyer’s reaction is useful for:

a) Introducing alkyl group

b) Introducing –Cl, –Br, –CN groups

c) Removing nitrogen group

d) Introducing –OH

Answer: b) Introducing –Cl, –Br, –CN groups

Explanation: Sandmeyer uses Cu salts with diazonium salts.

Q24. Coupling reaction of diazonium salts gives:

a) Phenols

b) Azo dyes

c) Nitro compounds

d) Amines

Answer: b) Azo dyes

Explanation: Diazonium salts couple with phenols or anilines to form azo dyes.

Q25. Diazotisation is the process of:

a) Preparing aldehydes

b) Preparing ketones

c) Converting amine to diazonium salt

d) Preparing alcohols

Answer: c) Converting amine to diazonium salt

Explanation: Primary aromatic amine reacts with nitrous acid to give diazonium salt.

Q26. Boiling point of amines is higher than alkanes due to:

a) Dipole-dipole interactions

b) Hydrogen bonding

c) Ionic bonding

d) Vander Waals forces only

Answer: b) Hydrogen bonding

Explanation: Primary and secondary amines form intermolecular hydrogen bonds.

Q27. The order of solubility of amines in water is:

a) Primary > Secondary > Tertiary

b) Secondary > Tertiary > Primary

c) Tertiary > Secondary > Primary

d) Equal

Answer: a) Primary > Secondary > Tertiary

Explanation: Solubility decreases as hydrogen bonding capability decreases.

Q28. Which one is least basic in aqueous medium?

a) CH₃NH₂

b) (CH₃)₂NH

c) (CH₃)₃N

d) Aniline

Answer: d) Aniline

Explanation: Resonance in aniline reduces electron density on N.

Q29. The basic character of aliphatic amines is due to:

a) Inductive effect of alkyl groups

b) Resonance

c) Aromatic ring

d) Electrostatic repulsion

Answer: a) Inductive effect of alkyl groups

Explanation: Alkyl groups push electrons toward nitrogen, increasing basicity.

Q30. Which medium increases basic strength of amines?

a) Gaseous state

b) Aqueous solution

c) Solid state

d) None

Answer: a) Gaseous state

Explanation: In gas phase, no solvation effect. Basicity depends only on +I effect.

Q31. Hinsberg test is used to distinguish:

a) Alcohols

b) Amines

c) Aldehydes

d) Acids

Answer: b) Amines

Explanation: Differentiates primary, secondary, tertiary amines.

Q32. Which amine does not respond to Hinsberg’s test?

a) Primary

b) Secondary

c) Tertiary

d) All

Answer: c) Tertiary

Explanation: Tertiary amines do not react with Hinsberg’s reagent.

Q33. Primary amine with nitrous acid gives:

a) Alcohol

b) Hydrocarbon

c) Phenol

d) Diazonium salt

Answer: d) Diazonium salt (aromatic) or alcohol (aliphatic)

Explanation: Aromatic → diazonium salt, aliphatic → alcohol + N₂ gas.

Q34. Secondary amine with nitrous acid gives:

a) Nitrosamine

b) Alcohol

c) Diazonium salt

d) Amide

Answer: a) Nitrosamine

Explanation: Characteristic yellow oily nitrosamine.

Q35. Tertiary amine with nitrous acid gives:

a) Nitrosamine

b) Alcohol

c) Salt of amine

d) Hydrocarbon

Answer: c) Salt of amine

Explanation: Forms insoluble amine salt with HNO₂.

Q36. Which compound is used in the preparation of azo dyes?

a) Diazonium salts

b) Carboxylic acids

c) Alcohols

d) Ketones

Answer: a) Diazonium salts

Explanation: Diazonium salts couple to form azo dyes.

Q37. Aniline on acetylation with acetic anhydride gives:

a) Acetanilide

b) Phenol

c) Nitroaniline

d) Benzamide

Answer: a) Acetanilide

Explanation: Used to protect amino group.

Q38. Which of the following amines is used in making artificial silk?

a) Aniline

b) Diphenylamine

c) Methylamine

d) Ethylamine

Answer: a) Aniline

Explanation: Aniline is used in dyes and artificial silk.

Q39. Explosives like TNT are prepared from:

a) Aniline

b) Nitrobenzene

c) Toluene

d) Benzamide

Answer: c) Toluene

Explanation: Toluene nitration gives trinitrotoluene.

Q40. Ethylamine reacts with acetyl chloride to form:

a) Ethanamide

b) Acetamide

c) N-ethylacetamide

d) Aniline

Answer: c) N-ethylacetamide

Explanation: Acylation of amine gives substituted amide.

Q41. The order of basicity in aqueous solution is:

(CH₃)₂NH > CH₃NH₂ > (CH₃)₃N. Why?

Answer: Due to solvation. Secondary amines form stronger hydrogen bonds than tertiary.

Q42. Which method can prepare pure aromatic primary amine?

a) Reduction of nitrobenzene

b) Gabriel synthesis

c) Hoffmann bromamide reaction

d) Ammonolysis

Answer: a) Reduction of nitrobenzene

Explanation: Nitrobenzene reduction gives aniline.

Q43. Which reagent converts amines to alkyl isocyanides (carbylamines)?

a) Chloroform + KOH

b) NaNO₂ + HCl

c) Acetyl chloride

d) HNO₃

Answer: a) Chloroform + KOH

Explanation: Carbylamine test identifies primary amines.

Q44. The product of reduction of diazonium salt with hypophosphorous acid is:

a) Benzene

b) Aniline

c) Phenol

d) Chlorobenzene

Answer: a) Benzene

Explanation: –N₂ group replaced by H.

Q45. Which amine does not undergo acylation?

a) Primary

b) Secondary

c) Tertiary

d) All

Answer: c) Tertiary

Explanation: Tertiary amines lack –NH hydrogen.

Q46. Aniline is less basic than cyclohexylamine because:

a) Inductive effect

b) Resonance

c) Steric hindrance

d) Solvation

Answer: b) Resonance

Explanation: Lone pair delocalization lowers basicity.

Q47. Which amine forms stable diazonium salt at 0–5°C?

a) Ethylamine

b) Aniline

c) Dimethylamine

d) Tertiary butylamine

Answer: b) Aniline

Explanation: Only aromatic diazonium salts are stable.

Q48. Which one is used as intermediate for dyes, drugs, polymers?

a) Aniline

b) Nitrobenzene

c) Phenol

d) Acetanilide

Answer: a) Aniline

Explanation: Aniline is a major industrial raw material.

Q49. Which of the following is true?

a) Aromatic amines are stronger bases than aliphatic amines

b) Aliphatic amines are stronger bases than aromatic amines

c) Both have same basicity

d) Cannot be compared

Answer: b) Aliphatic amines are stronger bases than aromatic amines

Explanation: Resonance in aromatic reduces electron density.

Q50. Which property differentiates primary, secondary and tertiary amines?

a) Physical state

b) Hinsberg test

c) Melting point

d) Odor

Answer: b) Hinsberg test

Explanation: Hinsberg test is a reliable chemical distinction.