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(A) Grignard reagents $(R-MgX)$ react with esters $(R-COOR')$ in excess to form tertiary alcohols after hydrolysis. Specifically,the reaction of an es

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An ester

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(A) Grignard reagents $(R-MgX)$ react with esters $(R-COOR')$ in excess to form tertiary alcohols after hydrolysis. Specifically,the reaction of an ester with two equivalents of a Grignard reagent involves the formation of a ketone intermediate,which then reacts with the second equivalent of the Grignard reagent to form an alkoxide,yielding a tertiary alcohol upon hydrolysis. Aldehydes (except formaldehyde) yield secondary alcohols,and primary alcohols are not typically formed from Grignard reactions with carbonyl compounds in this manner.

The adduct of the compound $'A'$ obtained by the reaction with excess of isopropyl magnesium iodide,upon hydrolysis gives a tertiary alcohol. The compound $'A'$ is

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