The principal product of the reaction between methyl butanoate and 2 moles of ${C H}_{3} M g B r$ after hydrolysis is:

C_{3} H_{7} C O {C H}_{3}

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C_{3} H_{7} C (O H) {({C H}_{3})}_{2}

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C_{3} H_{7} C H O {C H}_{3}

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C_{3} H_{7} C O C O {({C H}_{3})}_{2}

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Solution

The correct option is B $C_{3} H_{7} C (O H) {({C H}_{3})}_{2}$
When methyl butanoate reacts with $2$ moles of $C H_{3} M g B r$ , then after hydrolysis, the reaction proceeds as follows.
Refer to image,
Thus in the above reaction, the carbonyl group is replaced by the $- O H$ group and methyl group from the Grignard reagent is added to the same carton.

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