Consider the following reactions $\mathrm{C}_2 \mathrm{H}_2+\mathrm{H}_2 \mathrm{O} \xrightarrow[333…

Consider the following reactions $\mathrm{C}_2 \mathrm{H}_2+\mathrm{H}_2 \mathrm{O} \xrightarrow[333 \mathrm{~K}]{\mathrm{Hg}^{2+} / \mathrm{H}^{+}}[\mathrm{X}] \stackrel{\text { Isomerisation }}{\rightleftharpoons} \mathrm{Y}$ Y cannot be obtained from which of the following reactions?
  1. $\mathrm{CH}_3 \mathrm{COCl}+\mathrm{H}_2 \xrightarrow{\mathrm{Pd} / \mathrm{BaSO}_4}$
  2. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH} \xrightarrow{\mathrm{Cu} / 573 \mathrm{~K}}$
  3. $\mathrm{CH}_3 \mathrm{CN}+\mathrm{SnCl}_2+\mathrm{HCl} \longrightarrow \mathrm{X} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}}$
  4. $\mathrm{CH}_3 \mathrm{COOH} \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}]{\text { (i) } \mathrm{Lill}_4 / \text { ether }}$

Solution


Rosenmund Reaction : $\mathrm{CH}_3 \mathrm{COCl}+\mathrm{H}_2 \xrightarrow{\mathrm{Pd} / \mathrm{BaSO}_4} \mathrm{CH}_3 \mathrm{CHO}+\mathrm{HCl}$ Dehydrogenation: $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH} \xrightarrow{\mathrm{Cu} / 573 \mathrm{~K}} \mathrm{CH}_3 \mathrm{CHO}+\mathrm{H}_2$ Stephen Reduction :
Reduction : $\mathrm{CH}_3 \mathrm{COOH} \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}]{\text { (i) } \mathrm{LiAlH}_4 / \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}}$

Asked in: AP EAMCET 2024 (22 May Shift 2)

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