Identify 'A' in the following reaction : [figure]
- [figure]
- [figure]
- [figure]
- [figure]
Answer
(4) [figure]
Solution
Wolff–Kishner reduction: C=O group → CH2 group
[figure]
∵ the hydrazone formed in step (i) loses N2 on heating with KOH in ethylene glycol ⇒ C=O becomes CH2
⇒ 'A' = CH3-CH2-CH2-CH3 (butane)
(A): alcohol forms with NaBH4/LiAlH4, not here ⇒ (A) is wrong
(B), (C): hydrazones are only intermediates ⇒ (B), (C) are wrong
Answer: (4)