Describe the shape of the nitrogen atom in a simple aliphatic amine such as $\text{CH}_3\text{NH}_2$, and explain how this shape is responsible for the amine's basic character.

Describe the shape of the nitrogen atom in a simple aliphatic amine such as CH₃NH₂, and explain how this shape

Example · Example 8

\text{CH}_3\text{NH}_2

West Bengal WbchseTextbookSubjectiveImportance★★★★★est

14% · 8/56 Questions

🔒 Locked · start free trial →

You're viewing a preview — the full solution, concept, methods & PYQ mapping are locked.

Start your 14-day free trial to unlock the full solution →

Nitrogen in $\text{CH}_3\text{NH}_2$ forms three $\sigma$ bonds (to one carbon and two hydrogens) and retains one lone pair, giving it four electron domains arranged tetrahedrally -- three bonds plus the lone pair occupying the fourth position, so the molecular shape (ignoring the lone pair) is PYRAMIDAL, exactly like ammonia. This lone pair points outward, away from the three substituents, and is fully available to accept an incoming proton ( $\text{H}^+$ ) from an …

Start your 14-day free trial to unlock the full solution →

Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2026Set ANNUAL1 markMCQ
$Q. Tertiary amine is$
(a) n-propylamine
(b) Isopropylamine
(c) Ethylmethylamine
(d) Trimethylamine
›Reveal solutionSolution
Amines are classified 1°/2°/3° by the number of alkyl/aryl groups replacing the H atoms of NH3.

n-propylamine, CH3CH2CH2NH2: one alkyl group -> 1°

Isopropylamine, (CH3)2CHNH2: one alkyl group -> 1° …
Start your 14-day free trial to see the full solution →
CBSE 2026Set ANNUAL1 markMCQ
$Q. Hybridised state of nitrogen atom in amine is$
(a) sp
(b) sp2
(c) sp3
(d) sp3d2
›Reveal solutionSolution

Nitrogen in an amine has four electron domains (3 bonding pairs + 1 lone pair), which arrange tetrahedrally, corresponding to sp3 hybridisation.

…

Start your 14-day free trial to see the full solution →
CBSE 2026Set ANNUAL1 mark
$Q. The shape of trimethylamine is ______ (fill in the blank).$
›Reveal solutionSolution

Like other amines, trimethylamine's N atom is sp3 hybridised with 3 bond pairs (to the 3 methyl groups) and 1 lone pair, giving a pyramidal (trigonal pyramidal) molecu …

Start your 14-day free trial to see the full solution →
CBSE 2023Set ANNUAL1 markMCQ
$Q. Which of the following is functional group of primary amine?$
(a) -NH
(b) -NH2
(c) -NH3
(d) -NH4+
›Reveal solutionSolution

A primary amine has exactly one alkyl/aryl group attached to nitrogen, with the remaining two bonds to hydrogen, giving the -NH2 functional group.

Amines are classified by how many H atoms of NH3 are replaced by alkyl/aryl groups: primary amines (R-NH2, one substitution), secondary amines (R2NH, two substitution …

Start your 14-day free trial to see the full solution →
CBSE 2020Set ANNUAL1 mark
$Q. Write the formula of primary amine.$
›Reveal solutionSolution

A primary amine has the general formula $R\text{-}NH_2$ .

Amines are derivatives of ammonia ( $NH_3$ ) obtained by replacing one, two or three hydrogen atoms with alkyl/aryl groups, giving primary, secondary and tertiary amines respectively. A primary amine has only ONE hydrogen of ammonia replaced by an alkyl or aryl (R) group, s …

Start your 14-day free trial to see the full solution →

←Previous questionExample 7 — Classify CH₃CH₂NH₂, (CH₃CH₂)₂NH and (CH₃CH₂)₃N as primary, secondary a…→Next questionExample 9 — Write the IUPAC name of C₆H₅NHCH₃ and classify it as primary, secondar…

Q.Describe the shape of the nitrogen atom in a simple aliphatic amine such as $\text{CH}_3\text{NH}_2$ , and explain how this shape is responsible for the amine's basic character.

Concept understanding — Classification and Structure of Amines

Q.Describe the shape of the nitrogen atom in a simple aliphatic amine such as CH3NH2\text{CH}_3\text{NH}_2CH3​NH2​, and explain how this shape is responsible for the amine's basic character.

🎓Unlock everything free for 14 days

Q.Describe the shape of the nitrogen atom in a simple aliphatic amine such as $\text{CH}_3\text{NH}_2$ , and explain how this shape is responsible for the amine's basic character.

Unlock everything free for 14 days