Clemmensen reduction of a ketone is carried out in the presence of :

1. $\mathrm{LiAlH}_4$
2. $\mathrm{Zn}-\mathrm{Hg}$ with $\mathrm{HCl}$
3. Glycol with $\mathrm{KOH}$
4. $\mathrm{H}_2$ with $\mathrm{Pt}$ as catalyst

Asked in: JEE Main 2013 (22 Apr Online)

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