The structure of the starting compound P used | vedclass

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Question

(A) The given reaction is a haloform reaction,which is characteristic of methyl ketones $(R-CO-CH_3)$.In the presence of a hypohalite reagent like $Na

Vedclass · Accepted Answer

$CH_3-CH=CH-COCH_3$

Vedclass · Answer

(A) The given reaction is a haloform reaction,which is characteristic of methyl ketones $(R-CO-CH_3)$.In the presence of a hypohalite reagent like $NaOCl$ followed by acidic workup $(H_3O^+)$,a methyl ketone is oxidized to a carboxylic acid and chloroform $(CHCl_3)$ is produced as a byproduct.The product shown in the reaction is crotonic acid $(CH_3-CH=CH-COOH)$.Therefore,the starting compound $P$ must be the corresponding methyl ketone,which is $CH_3-CH=CH-COCH_3$ (pent$-3-$en$-2-$one).

The structure of the starting compound $P$ used in the reaction given below is:

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