The correct IUPAC name for $CH_2=CHCH_2NHCH_3$.

N-Methylprop-2-en-1-amine

The correct answer is Option (4) → N-Methylprop-2-en-1-amine

Core Concept

IUPAC naming of amines follows:

• Longest carbon chain attached to nitrogen is parent chain

• Amino group gets lowest possible position

• Substituents on nitrogen are written with prefix N-

Explanation

Option 1: Allylmethylamine

This is a common name, not IUPAC name.

Option 2: 2-Amino-4-pentene

This suggests a 5-carbon chain, which is incorrect.

Option 3: 4-Amino-pent-1-ene

Also implies incorrect parent chain.

Option 4: N-Methylprop-2-en-1-amine

Parent chain = propene

–NHCH₃ group attached at carbon-1

Double bond at carbon-2

Methyl group attached to nitrogen