NEET ChemistryUpdated 19 Oct 2026

Amines: NEET PYQs and weightage

Amines carries 4.1 of 100 Chemistry marks in NEET by past-paper share: 29 of the 707 tagged NEET Chemistry PYQs in the ViJEEta bank (NEET 2013–2026). It ranks 10 of 26 Chemistry chapters.

Take the 25-question Amines test Key facts ↓All NEET Chemistry chapters

4.1/100 Weight in Chemistry

Exam importance (3/5, by past-paper share)

29 NEET PYQs

393 Practice questions

370 With measured difficulty

How the weight is computed: this chapter's tagged NEET PYQs divided by all tagged NEET Chemistry PYQs in the bank (29 of 707), times 100, with repeated questions counted once. The bank does not store the year of each NEET question, so none is printed. Computed from the bank at build time. Updated 19 Oct 2026.

Amines: key facts for NEET

16 facts the paper keeps asking, each with how it is asked. Copy it onto one page of your notebook: that page is this chapter's handbook.

Structure of amines
N in amines is $s p^{3}$ with one lone pair, so amines are pyramidal; the C–N–C angle in trimethylamine is $10 8^{\circ}$ , below $109. 5^{\circ}$ .
Asked as: hybridisation and shape of $(C H_{3})_{3} N$ , or why its bond angle is less than tetrahedral.
IUPAC names
$C H_{3} N H_{2}$ is methanamine, $(C H_{3} C H_{2})_{3} N$ is N,N-diethylethanamine, and aniline is also accepted as benzenamine.
Asked as: pick the correct IUPAC name of a given $2^{\circ}$ or $3^{\circ}$ amine.
Reduction of nitro compounds
Nitro compounds are reduced best with Fe scrap + $HCl$ , because the $FeC l_{2}$ formed hydrolyses and gives back $HCl$ , so only a little acid is needed.
Asked as: why $Fe/HCl$ is preferred over other metal/acid pairs.
Ammonolysis
Ammonolysis uses ethanolic $N H_{3}$ in a sealed tube at $373 K$ . It gives a mixture of $1^{\circ}$ , $2^{\circ}$ and $3^{\circ}$ amines plus a quaternary salt. A large excess of $N H_{3}$ makes the $1^{\circ}$ amine the major product. Halide reactivity: $RI > RBr > RCl$ .
Asked as: the drawback of ammonolysis, or how to get mainly the $1^{\circ}$ amine.
Reduction of nitriles
Nitriles reduced by $LiAl H_{4}$ or $H_{2}$ /catalyst give $1^{\circ}$ amines with one carbon more, so this is an ascent of the amine series.
Asked as: a conversion such as $C H_{3} C H_{2} Cl \to C H_{3} C H_{2} C H_{2} N H_{2}$ (via $KCN$ , then reduction).
Gabriel phthalimide synthesis
Gabriel phthalimide synthesis (ethanolic $KOH$ , then $R - X$ , then alkaline hydrolysis) gives only $1^{\circ}$ amines. It cannot give aromatic amines, because aryl halides do not undergo substitution with the phthalimide anion.
Asked as: why aniline cannot be made by Gabriel synthesis.
Hoffmann bromamide degradation
Hoffmann bromamide degradation (amide + $B r_{2}$ + $NaOH$ ) gives a $1^{\circ}$ amine with one carbon less than the amide. For example, benzamide gives aniline and butanamide gives propanamine.
Asked as: name the starting amide, or the $C_{6} H_{7} N$ product of $A \to B \to C$ .
Boiling points
Boiling points of isomeric amines follow $1^{\circ} > 2^{\circ} > 3^{\circ}$ , since $3^{\circ}$ amines have no N–H for H-bonding. Alcohols boil higher than amines: butan-1-ol is $390.3 K$ , butan-1-amine is $350.8 K$ .
Asked as: arrange in increasing b.p., e.g. $C_{2} H_{5} OH$ , $(C H_{3})_{2} NH$ , $C_{2} H_{5} N H_{2}$ .
pKb values
$p K_{b}$ values: $N H_{3}$ is $4.75$ , aliphatic amines are $3$ to $4.22$ (stronger bases, $+ I$ effect), and aniline is $9.38$ (weaker base). A smaller $p K_{b}$ means a stronger base.
Asked as: why the $p K_{b}$ of aniline is more than that of methylamine.
Basicity order: gas phase vs water
In the gas phase basicity follows $3^{\circ} > 2^{\circ} > 1^{\circ} > N H_{3}$ . In water: $(C H_{3})_{2} NH > C H_{3} N H_{2} > (C H_{3})_{3} N > N H_{3}$ , and $(C_{2} H_{5})_{2} NH > (C_{2} H_{5})_{3} N > C_{2} H_{5} N H_{2} > N H_{3}$ . The water order comes from the combined inductive effect, solvation and steric hindrance.
Asked as: the correct basic-strength order in aqueous solution.
Basicity of aniline
Aniline has 5 resonance structures but the anilinium ion has only 2, so aniline is less basic than $N H_{3}$ . Groups like $- OC H_{3}$ and $- C H_{3}$ raise basicity, while $- N O_{2}$ , $- S O_{3} H$ , $- COOH$ and $- X$ lower it.
Asked as: order aniline, p-nitroaniline and p-toluidine by basic strength.
Carbylamine test
In the carbylamine test, a $1^{\circ}$ amine (aliphatic or aromatic) heated with $CHC l_{3}$ + ethanolic $KOH$ gives a foul-smelling isocyanide. $2^{\circ}$ and $3^{\circ}$ amines do not respond.
Asked as: a test for $1^{\circ}$ amines, or to tell methylamine from dimethylamine.
Reaction with nitrous acid
With $HN O_{2}$ ( $NaN O_{2}$ + mineral acid), $1^{\circ}$ aliphatic amines release $N_{2}$ quantitatively and form alcohols. Aromatic $1^{\circ}$ amines at $273 - 278 K$ form diazonium salts (diazotisation).
Asked as: which $C_{3} H_{9} N$ isomers liberate $N_{2}$ with nitrous acid.
Hinsberg's reagent
Hinsberg's reagent ( $C_{6} H_{5} S O_{2} Cl$ ): the $1^{\circ}$ sulphonamide has an acidic N–H and dissolves in alkali. The $2^{\circ}$ sulphonamide has no N–H and is insoluble in alkali. $3^{\circ}$ amines do not react. p-Toluenesulphonyl chloride is now used instead.
Asked as: distinguish or separate $1^{\circ}$ , $2^{\circ}$ and $3^{\circ}$ amines.
Electrophilic substitution in aniline
Bromine water gives a white precipitate of 2,4,6-tribromoaniline. Acetylation is used to tame the $- N H_{2}$ group. Direct nitration gives a substantial amount of meta product, because the anilinium ion is meta-directing. Aniline does not undergo Friedel–Crafts, because it forms a salt with $AlC l_{3}$ .
Asked as: why nitration of aniline gives m-nitroaniline, or how to make p-bromoaniline.
Diazonium salt reactions
$Cu (I)$ with $C l^{-}$ , $B r^{-}$ or $C N^{-}$ is the Sandmeyer reaction, which gives a better yield than Gattermann (Cu powder + $HX$ ). $KI$ gives iodobenzene. $HB F_{4}$ followed by heating gives aryl fluoride. $H_{3} P O_{2}$ or ethanol gives the arene. Warming to $283 K$ gives phenol. Coupling with phenol at the para position gives p-hydroxyazobenzene.
Asked as: identify the reagent or product for a given diazonium conversion.

Trap

In water, 3° amines are not the strongest bases. The order 3° > 2° > 1° holds only in the gas phase; in water the 2° amine is the strongest, and the methyl and ethyl series have different orders.

How does NEET ask Amines?

7 real previous-year questions from this chapter, as printed in the paper, each with its worked solution. Answer the first one here with no sign-in.

Q1ChemistryNEET UG PYQIntroduction to Amines

Try right here · No sign-in

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

Answer key (D) & worked solution

Correct answer: Option D

They have very low melting and boiling points because the only type of interatomic interaction in these elements is weak dispersion forces.

Q2ChemistryNEET UG PYQProperties of Aniline

Which of the following will be most stable diazonium salt

R N_{2}^{+} X^{-}

C H_{3} C H_{2} N_{2}^{+} X^{-}

C_{6} H_{5} C H_{2} N_{2}^{+} X^{-}

C H_{3} N_{2}^{+} X^{-}

C_{6} H_{5} N_{2}^{+} X^{-}

Answer key (D) & worked solution

Correct answer: Option D

Reactivity order is

C_{6} H_{5} C H_{2} N_{2}^{+} X^{-} > C H_{3} C H_{2} N_{2}^{+} X^{-} > C H_{3} N_{2}^{+} X^{-} > C_{6} H_{5} N_{2}^{+} X^{-}

C_{6} H_{5} N_{2}^{+} X^{-}

is least reactive because of formation of unstable carbocation. So it is more stable.

Q3ChemistryNEET UG PYQProperties of Aniline

Given below are two statements: Statement I: Aniline does not undergo Friedel-Crafts alkylation reaction. Statement II: Aniline cannot be prepared through Gabriel synthesis In the light of the above statement, choose the correct answer from the options given below:

ABoth statement I and statement II are false

BStatement I is correct but statement II is false

CStatement I is incorrect but statement II is true

DBoth statement I and statement II are true

Answer key (D) & worked solution

Correct answer: Option D

Statement-I right statement Aniline will undergo acid base reaction with Lewis acid catalyst of Friedel-Crafts alkylation Statement-II right statement Aromatic halides cannot undergo S

_{N}

2 reactions

Q4ChemistryNEET UG PYQIntroduction to Amines

A bulb is rated at 150 watt, converting

8%

energy into light. If energy of one photon is

4.42 \times 1 0^{- 19} J

, how many photons are emitted by the bulb per second?

1.35 \times 1 0^{19}

4.06 \times 1 0^{19}

2.71 \times 1 0^{19}

27.2 \times 1 0^{19}

Answer key (C) & worked solution

Correct answer: Option C

Energy = Power \times time = 150 watt \times 1 s = 150 J

Energy converted to light

= \frac{150 \times 8}{100} = 12 J

E = nh ν

Energy of one photon

= 4.42 \times 1 0^{- 19}

So,

n =

number of photons

= \frac{E}{h ν} = \frac{12}{4.42 \times 1 0 ^{- 19}}

= 2.715 \times 1 0^{19}

Q5ChemistryNEET UG PYQProperties of Aniline

Given below are two statements: Statement I: Benzenediazonium salt is prepared by the reaction of aniline with acid at 273 - 278 K. It decomposes easily in the dry state. Statement II: Insertion of iodine into the benzene ring is difficult and hence iodobenzene is prepared through the reaction of benzenediazonium salt with KI. in the light of the above statements, choose the most appropriate answer from the options given below:

AStatement I is correct but Statement II is incorrect

BStatement I is incorrect but Statement II is correct

CBoth Statement I and Statement II are correct

DBoth Statement I and Statement II are incorrect

Answer key (A) & worked solution

Correct answer: Option A

Statement I is correct but Statement II is incorrect

Q6ChemistryNEET UG PYQPreparation of Amines

Select the reagents that reduce nitriles to primary amines. A. (i)

LiAlH_{4}

; (ii)

H_{2} O

Sn + HCl

H_{2} / Ni

Na (Hg) / C_{2} H_{5} OH

Br_{2} /

aq. NaOH Choose the correct answer from the options given below.

AA, B and C only

BA, C and D only

CA, D and E only

DB, D and E only

Answer key (B) & worked solution

Correct answer: Option B

R - CN Na (Hg) / C_{2} H_{5} OH R - CH_{2} - NH_{2}

R - CN (i) LiAlH_{4} (ii) H_{2} O R - CH_{2} - NH_{2}

R - CN Sn + HCl R - CHO

R - CN H_{2} / Ni R - CH_{2} - NH_{2}

Q7ChemistryNEET UG PYQChemical Properties of Amines

The correct order of decreasing basic strength of the given amine is :

AN-ethylethangmine > ethanamine > N-methylaniline > benzenamine

BBenzenamine > ethanamine > N-methylaniline > N-ethylethanamine

CN-methylaniline > benzenamine > ethanamine > N-ethylethanamine

DN-ethylethanamine > ethanamine > benzenamine > N-methylaniline

Answer key (A) & worked solution

Correct answer: Option A

N-ethylethangmine > ethanamine > N-methylaniline > benzenamine

Which topics in Amines carry the most questions?

All 10 topics, by tagged PYQs, then practice questions. Counted from the bank. Updated 19 Oct 2026.

Topic	PYQs	Practice questions
Chemical Properties of Amines	10	150
Properties of Aniline	10	83
Preparation of Amines	5	63
Introduction to Amines	3	39
Test of Amines	1	30
Physical Properties of Amines	0	11
Preparation of Aniline	0	7
Introduction to Aniline	0	6
Miscellaneous Examples	0	2
Uses of Amines	0	2

Why does Amines show "–" until you answer 3 questions?

Unknown is not zero. Until you answer at least 3 graded questions in Amines, ViJEEta shows – instead of a zero or a 50% default. Book exercises can raise chapter mastery up to 0.60, adaptive practice up to 0.75, and only a timed chapter test or mock can certify 0.80 and above.

How ViJEEta scores you

What happens when you test Amines?

Every chapter test is 25 questions. It starts at moderate difficulty and adapts after each saved answer. If you open a solution before answering, that attempt earns no credit, so your mastery stays honest.

Start the Amines test

Chapters either side of Amines by weight

Electrochemistry Weight 4.2/100 Thermodynamics Weight 4.2/100 Biomolecules Weight 4.1/100 Aldehydes and Ketones Weight 4.0/100

Amines: NEET PYQs and weightage

Amines: key facts for NEET

Structure of amines

IUPAC names

Reduction of nitro compounds

Ammonolysis

Reduction of nitriles

Gabriel phthalimide synthesis

Hoffmann bromamide degradation

Boiling points

pKb values

Basicity order: gas phase vs water

Basicity of aniline

Carbylamine test

Reaction with nitrous acid

Hinsberg's reagent

Electrophilic substitution in aniline

Diazonium salt reactions

How does NEET ask Amines?

Which topics in Amines carry the most questions?

Why does Amines show "–" until you answer 3 questions?

What happens when you test Amines?

Chapters either side of Amines by weight