Amines NEET Questions and Answers Pdf
Ace Amines for NEET Chemistry with our free chapter-wise questions and answers PDF – designed for self-study and aligned with NCERT + Maharashtra State Board syllabi. This resource compiles Amines previous year questions (PYQ) from NEET 2018-2026, including detailed solutions for reactions like Gabriel phthalimide synthesis, Hoffman bromamide degradation, and diazotization.
Our Amines NEET Questions and Answers Pdf cover classification, nomenclature, and biochemical roles (e.g., adrenaline, neurotransmitters), with tricks to tackle assertion-reasoning and statement-based problems. Whether revising basic strength comparison or Curtius rearrangement, these NEET Amines PYQs help you:
Important Points to Remember about Nitrogen Compounds
- Amines are derivatives of ammonia in which one or more hydrogen atoms are replaced by alkyl group(s).
- Amines are classified as primary, secondary and tertiary depending on the number of alkyl groups attached to nitrogen atom.
- Nitrosoamines are carcinogens (Cancer causing agents)
- Amines can have chiral N-atom but cannot be resolved into enantiomeric forms because of rapid inversion of one enantiomeric form into the other. The Schiff’s bases formed by reaction of 1°-amines and aldehyde/ketones are also called anils.
- The mixture of 1°, 2°, 3° amines can be distinguished by Hofmann’s test or Hinsberg’s reagent or nitrous acid test.
- The compounds in which both proton donating & proton accepting groups present are called ampholite (dipolar ion).
- Aniline reacts with acid chlorides or anhydrides to form corresponding amides called anilides.
- Low molecular weight amines are soluble in water. The water solubility of amines decreases with increasing size of alkyl group.
- Due to weak intermolecular H-bonding the B.P. of 1° and 2° amines are lower than those.of alcohols of comparable molecular weight. The boiling point of 3° amines which form no H–bonds are near to those of alkanes of comparable molecular weight.
Amines NEET Questions and Answers Pdf
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1) Which of the following statements about primary amines is ‘False’?
(1) Alkyl amines are stronger bases than ammonia
(2) Alkyl amines are stronger bases than aryl amines
(3) Alkyl amines react with nitrous acid to produce alcohols
(4) Aryl amines react with nitrous acid to produce phenols
Answer: 4
Explanation: Aryl amines react with nitrous acid to form diazonium salts, not phenols directly unless hydrolyzed further under specific conditions.
2) Which of the following is used as a solvent in the Friedel–Crafts reaction
(1) Toluene
(2) Nitrobenzene
(3) Benzene
(4) Aniline
Answer: 2
Explanation: Nitrobenzene is often used as a solvent in Friedel–Crafts reactions due to its non-reactive nature under the conditions.
3) Which of the following reactions is appropriate for converting acetamide to methanamine?
(1) Hoffmann hypobromamide reaction
(2) Stephens reaction
(3) Gabriels phthalimide synthesis
(4) Carbylamine reaction
Answer: 1
Explanation: The Hoffmann hypobromamide reaction converts amides to amines with one less carbon atom.
4) Acetamide is treated with the following reagents separately. Which one of these would yield methyl amine?
(1) PCl5
(2) NaOH/Br2
(3) Sodalime
(4) Hot conc. H2SO4
Answer: 2
Explanation: NaOH/Br2 triggers Hoffmann rearrangement of acetamide to methylamine.
5) Method by which Aniline cannot be prepared is
(1) reduction of nitrobenzene with H2/Pd in ethanol
(2) potassium salt of phthalimide treated with chlorobenzene followed by hydrolysis with aqueous NaOH solution
(3) hydrolysis of phenylisocyanide with acidic solution
(4) degradation of benzamide with bromine in alkaline solution
Answer: 2
Explanation: Gabriel synthesis does not work well for aryl halides like chlorobenzene due to low reactivity.
6) The electrolytic reduction of nitrobenzene in strongly acidic medium produces
(1) Azoxybenzene
(2) Azobenzene
(3) Aniline
(4) p-Aminophenol
Answer: 4
Explanation: In strongly acidic medium, nitrobenzene gets reduced to p-aminophenol.
7) Nitrobenzene on reaction with conc. HNO3/H2SO4 at 80–100°C forms which one of the following products?
(1) 1,2,4-Trinitrobenzene
(2) 1,2-Dinitrobenzene
(3) 1,3-Dinitrobenzene
(4) 1,4-Dinitrobenzene
Answer: 3
Explanation: The nitro group directs further nitration to the meta position, forming 1,3-dinitrobenzene.
8) Reaction of aniline with HNO2 followed by treatment with dilute acid gives
(1) C6H5NHOH
(2) C6H5OH
(3) C6H5NHNH2
(4) C6H6
Answer: 2
Explanation: Aniline reacts with HNO2 to form a diazonium salt, which hydrolyzes to phenol.
9) A compound of mol. wt. 180 gm is acetylated to give a compound of mol. wt. 390. The number of amino groups in the compound are
(1) 2
(2) 4
(3) 5
(4) 6
Answer: 3
Explanation: Each acetyl group adds 42 units; increase of 210 = 5 acetyl groups = 5 amino groups.
10) Which one of the following tests can be used to identify primary amino group in a given organic compound
(1) Iodoform test
(2) Victor Meyer’s test
(3) Carbylamine reaction
(4) Libermann’s reaction
Answer: 3
Explanation: The carbylamine reaction is a test specific for primary amines, producing foul-smelling isocyanides.
11) Nitration of which of the following compound is difficult
(1) Benzene
(2) Nitrobenzene
(3) Toluene
(4) Phenol
Answer: 2
Explanation: The nitro group is strongly deactivating and meta-directing, making nitration of nitrobenzene difficult.
12) Which one of following reaction is Schotten–Baumann reaction
(1) Acetylation of RNH2
(2) Acylation of RNH2
(3) Benzoylation of RNH2
(4) All of them
Answer: 4
Explanation: Schotten–Baumann reaction refers to benzoylation or acylation of amines under basic conditions—covers all listed.
13) Nitration of nitrobenzene in presence of fuming nitric acid will generate a
(1) Solid product
(2) Gaseous product
(3) Semi–solid product
(4) Liquid product
Answer: 1
Explanation: The resulting trinitrobenzene is a solid due to increased molecular mass and aromaticity.
14) Before proceeding for the nitration of aminobenzene, the NH2 group is first protected by
(1) Alkylation
(2) Acetylation
(3) Formylation
(4) Chloromethylation
Answer: 2
Explanation: Acetylation protects the NH2 group by reducing its activating effect and preventing oxidation.
15) Gabriel reaction for the synthesis of amines, involves the use of
(1) 1° amide
(2) 2° amide
(3) Imides
(4) Aliphatic amide
Answer: 3
Explanation: Gabriel synthesis uses phthalimide (an imide) to prepare primary amines.
16) Gabriel phthalimide reaction is used in the synthesis of
(1) Primary aromatic amines
(2) Secondary amines
(3) Primary aliphatic amines
(4) Tertiary amines
Answer: 3
Explanation: It is mainly suitable for synthesizing primary aliphatic amines.
17) Aniline is purified by
(1) Azeotropic distillation
(2) Steam distillation
(3) Distillation in presence of magnesium
(4) Fractional distillation
Answer: 2
Explanation: Aniline is steam volatile and hence separated from non-volatile impurities by steam distillation.
18) N,N–dimethyl acetamide is obtained in the reaction
(1) Acetyl chloride and methanamine
(2) Acetyl chloride and ethanamine
(3) Acetyl chloride and dimethylamine
(4) Acetyl chloride and diethylamine
Answer: 3
Explanation: Dimethylamine reacts with acetyl chloride to give N,N–dimethyl acetamide.
19) Melting points are normally the highest for
(1) Tertiary amides
(2) Secondary amides
(3) Primary amides
(4) Amines
Answer: 3
Explanation: Primary amides form strong hydrogen bonds, leading to high melting points.
20) Solubility of ethylamine in water is due to
(1) Low molecular weight
(2) Ethyl group is present in ethyl alcohol
(3) Formation of H–bonding with water
(4) Being a derivative of ammonia
Answer: 3
Explanation: Ethylamine forms hydrogen bonds with water, making it soluble.
21) At 0°C temperature reaction of aniline with HNO2 and subsequent treatment with alkaline beta–naphthol solution produces a precipitate whose colour would be
(1) Black
(2) Purple
(3) White
(4) Orange
Answer: 4
Explanation: The diazonium salt of aniline couples with β-naphthol to give an orange azo dye.
22) An aromatic compound A on treatment with Zn/NH4Cl, and subsequent filtration in ammonical silver nitrate solution gives a black precipitate. Hence compound A bears the group
(1) –COOH
(2) –NO2
(3) –CHO
(4) –NH2
Answer: 2
Explanation: Nitro compounds get reduced to amines, which then give positive tests with AgNO3 due to free –NH2.
23) Chloroform and ethanolic KOH is used as a reagent in the following reaction
(a) Hoffmann carbylamine reaction
(b) Hoffmann degradation reaction
(c) Reimer–Tiemann reaction
(d) Hoffmann mustard oil reaction
Code is
(1) Only for a
(2) Only for a and b
(3) Only for b and d
(4) Only for a and c
Answer: 4
Explanation: Chloroform with ethanolic KOH is used in both carbylamine and Reimer–Tiemann reactions.
24) Acetanilide when treated with bromine in acetic acid mainly gives
(1) o–Bromoacetanilide
(2) N–Bromoacetanilide
(3) p–Bromoacetanilide
(4) m–Bromoacetanilide
Answer: 3
Explanation: Due to the electron-donating nature of the amide group, bromination occurs mainly at the para position.
25) Which of the following compound gives an explosive on decarboxylation
(1) 2,4,6–Trinitrobenzoic acid
(2) 2,4–Dinitrobenzoic acid
(3) o–Aminobenzoic acid
(4) o–Hydroxybenzoic acid
Answer: 1
Explanation: 2,4,6–Trinitrobenzoic acid is highly explosive due to the presence of three nitro groups.
26) The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was
(1) Methylisocyanate
(2) Methylamine
(3) Ammonia
(4) Phosgene
Answer: 1
Explanation: Methyl isocyanate (MIC) was the deadly gas involved in the Bhopal gas tragedy.
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