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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$I :$ glycerol $II : $ glycol
$III : 1 , 3-$ propenediol $IV :$ methoxy $ -2- $ propanol