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  • The major product of the following reaction is :

Q.52) The major product of the following reaction is :

A)

B)

C)

D)

 

Answers (1)

best_answer

 We are given a compound with both a ketone and a cyano (–CN) group, and it is treated with excess CH?MgBr (a Grignard reagent), followed by acidic hydrolysis (H?O?).

Grignard + Ketone → Tertiary alcohol

$\mathrm{Ph}-\mathrm{CO}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CN}+\mathrm{CH}_3 \mathrm{MgBr} \rightarrow \mathrm{Ph}-\mathrm{C}\left(\mathrm{CH}_3\right)(\mathrm{OH})-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CN}$

Grignard + Nitrile → Imine salt → on hydrolysis → Ketone

$-\mathrm{CN}+\mathrm{CH}_3 \mathrm{MgBr} \rightarrow-\mathrm{C}=\mathrm{NMgBr} \rightarrow$ hydrolysis $\rightarrow-\mathrm{COCH}_3$

It shows two tertiary alcohols and two CH? groups on each alcohol carbon.

Hence the correct option is (4)

 

Posted by

Saumya Singh

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