Which of the following is Rosenmund reduction?

Which of the following is Rosenmund reduction?
  1. $\mathrm{R}-\mathrm{C} \equiv \mathrm{N}+2[\mathrm{H}] \underset{\mathrm{dil} \mathrm{HCl}}{\mathrm{SnCl}_{2}}{\longrightarrow} \mathrm{R}-\mathrm{CH}=\mathrm{NH} \cdot \mathrm{HCl} \stackrel{\mathrm{H}_{3} \mathrm{O}^{+}}{\longrightarrow} \mathrm{R}-\mathrm{CHO}+\mathrm{NH}_{4} \mathrm{Cl}$
  2. $\mathrm{R}-\mathrm{CH} \mathrm{O} \frac{\mathrm{H}_{2} \mathrm{~N}-\mathrm{NH}_{2}}{-\mathrm{H}_{2} \mathrm{O}}^{-} \mathrm{R}-\mathrm{CH}=\mathrm{N}-\mathrm{NH}_{2} \frac{\text { KOH/ethylene glycol }}{\Delta} \mathrm{RCH}_{3}+\mathrm{N}_{2}$

Solution

Option (3) is Rosenmund reduction

Asked in: MHT CET 2020 (12 Oct Shift 1)

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