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Question: Identify the product Y in the following reaction $H_3C-CH=CH-CH_2-\overset{O}{\underset{||}{C}}-H+H...

Identify the product Y in the following reaction

H3C−CH=CH−CH2−C∣∣O−H+H2→NiYH_3C-CH=CH-CH_2-\overset{O}{\underset{||}{C}}-H+H_2 \xrightarrow{Ni} Y

A

CH3−CH2−CH2−CH2−CH2−OHCH_3-CH_2-CH_2-CH_2-CH_2-OH

B

CH3−CH=CH−CH2−CH2−OHCH_3-CH=CH-CH_2-CH_2-OH

C

H3C−CH2−CH2−CH2−C∣∣O−HH_3C-CH_2-CH_2-CH_2-\overset{O}{\underset{||}{C}}-H

D

CH3−CH2−CH2−CH2−CH3CH_3-CH_2-CH_2-CH_2-CH_3

Answer

Option (c)

Explanation

Solution

The reactant is an unsaturated aldehyde:

CH3-CH=CH-CH2-CHO\text{CH}_3\text{-CH=CH-CH}_2\text{-CHO}

When treated with H2\text{H}_2 over a nickel catalyst, only the π\pi-bond (C=C) gets hydrogenated, while the carbonyl (C=O) group remains unaffected. This gives the saturated aldehyde:

CH3-CH2-CH2-CH2-CHO\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CHO}

Hydrogenation adds H2\text{H}_2 across the C=C bond. The C=O group in the aldehyde remains intact. Product: CH3-CH2-CH2-CH2-CHO\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CHO}.