Which reagent from following is used for preparation of aliphatic aldehyde from nitriles?

Which reagent from following is used for preparation of aliphatic aldehyde from nitriles?
  1. $\mathrm{CrO}_2 \mathrm{Cl}_2$ in $\mathrm{CS}_2$
  2. $\mathrm{CrO}_3$ in acetic anhydride
  3. $\mathrm{SnCl}_2, \mathrm{HCl}$
  4. $\mathrm{Co}, \mathrm{HCl}$, anhydrous $\mathrm{AlCl}_3$

Solution

$\underset{\text { Nitrile }}{\mathrm{R}-\mathrm{C} \equiv \mathrm{N} \xrightarrow[\text { (ii) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {(i) } \mathrm{SnCl}_2 / \mathrm{diil} . \mathrm{HCl}} \underset{\text { Aldehyde }}{\mathrm{RCHO}}+\mathrm{NH}_4 \mathrm{Cl}}$

Asked in: MHT CET 2024 (11 May Shift 1)

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