JEE Main Chemistry question
A keto-aldehyde bearing a phenyl-substituted branched chain (a ketone near the aromatic ring and an aldehyde at the far end of the chain) is subjected to the Wolff–Kishner reaction. The number of carbonyl (C=O) groups remaining in the product is .
Answer: 0
Solution
The Wolff–Kishner reaction (NH₂NH₂/KOH, heat) fully deoxygenates every reducible carbonyl group — both ketones and aldehydes — converting each C=O to a CH₂ group, with loss of N₂. Applied to a substrate bearing one ketone and one aldehyde, both carbonyl groups are removed, leaving 0 carbonyl groups in the product.
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