MCQ
Above conversion can be achieved by


- AWolff- Kishner reduction
- BClemmensen reduction
- C$HS -CH_2 -CH_2 -SH$, following by Raney $Ni$
- ✓None of these

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Reason : Resonance hybrid cannot be presented by a single structure.
$(A)$ Total number of valence shell electrons at metal centre in $Fe ( CO )_5$ or $Ni ( CO )_4$ is $16$
$(B)$ These are predominantly low spin in nature
$(C)$ Metal-carbon bond strengthens when the oxidation state of the metal is lowered
$(D)$ The carbonyl $C - O$ bond weakens when the oxidation state of the metal is increased