Carbonyl compounds can generally be converted to hydrocarbons by :

H_{2} / P t

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L i A l H_{4}

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N_{2} H_{4}, K O H / Δ

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K_{2} C r_{2} O_{7} - H_{2} S O_{4}

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Solution

The correct option is C $N_{2} H_{4}, K O H / Δ$
1. $H_{2} / P t$ reduce carnobyl to alcohols (Catalytic hydrogenation).
2. $L i A l H_{4}$ is strong reducing agent. It will reduce carbonyl to alcohols.
3. $N_{2} H_{4}, K O H / Δ$ is the reagent of Wolff-Kishner reduction. It will reduce carbonyl to hydrocarbons.
4. $K_{2} C r_{2} O_{7} - H_{2} S O_{4}$ is a strong oxidising agent. It will oxidise carbonyls to carboxylic acid.

Hence, option (c) is correct.

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