Question

Intramolecular hydrogen bonding is present in

• A.
• B.
• C.
• D. HF

Answer 1

Answer: (A)

Answer 2

1. Intramolecular hydrogen bonding occurs when a hydrogen atom forms a bond within the same molecule between a donor (e.g., OH, NH) and an acceptor (e.g., $NO_2$, CO).
2. Option (4) has OH and $NO_2$ groups in close proximity, allowing intramolecular hydrogen bonding.
3. The other options lack this spatial arrangement.