Identify reducing agent used for the following conversion. $\mathrm{R}-\mathrm{CHO} \rightarrow…

Identify reducing agent used for the following conversion. $\mathrm{R}-\mathrm{CHO} \rightarrow \mathrm{R}-\mathrm{CH}_2-\mathrm{OH}$
  1. $\mathrm{Na}$ /Dry ether
  2. $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 /$ dil. $\mathrm{H}_2 \mathrm{SO}_4$
  3. $\mathrm{LiAlH}_4 / \mathrm{H}_3 \mathrm{O}^{+}$
  4. $\mathrm{Sn} / \mathrm{HCl}$

Solution

$\mathrm{R}-\mathrm{CHO} \stackrel{\mathrm{LiAlH}_4 / \mathrm{H}_3 \mathrm{O}^{+}}{\longrightarrow} \mathrm{R}-\mathrm{CH}_2-\mathrm{OH}$

Asked in: MHT CET 2022 (07 Aug Shift 1)

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