What is the IUPAC name of allylamine?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Prop-2-en-1-amine
Allylamine is \( \ce{CH2=CH-CH2-NH2} \): an –\( \ce{NH2} \) group on the allyl group. In the IUPAC system an aliphatic amine is named as an alkanamine: the final ‘e’ of the parent hydrocarbon is replaced by ‘amine’, and the chain is numbered so that the carbon carrying –NH2 gets the lowest number.
Numbering starts at the \( \ce{CH2} \) that carries –\( \ce{NH2} \) (C-1), so the double bond lies between C-2 and C-3. A three-carbon chain with a double bond starting at C-2 is prop-2-ene, and the –\( \ce{NH2} \) is on C-1. The name is prop-2-en-1-amine.
NCERT (2026-27 edition):
Nomenclature – …
Note: The same/similar question has been asked in different years by NTA as per the details given below:
| 2026 | 2025 | 2024 | 2023 | 2022 |
|---|---|---|---|---|
| – | 29-05 S2 24-05 S2 | – | – | – |