Which of the following(s) gives a tertiary alcohol on treating with excess of Grignard reagent?

C H_{3} C H O

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C H_{3} C O C H_{3}

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P h C O C l

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P h C O O C H_{3}

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Solution

The correct option is D $P h C O O C H_{3}$
Grignard reagent act as a nucleophile in presence of an electrophilic site. Carbon in the carbonyls are electrophilic in nature, hence, Grignard reagent will undergo nucleophilic addition reactions.

Hence, (b), (c) and (d) are correct.

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