Which of the following pairs of carbonyl compounds and Grignard reagent should be chosen as reactants to prepare 2,4-dimethyl-3-pentanol?

C H_{3} C H_{2} C H_{2} C H O

and

C H_{3} C H_{2} C H_{2} M g B r

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

and

(C H_{3})_{2} C H M g B r

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C H_{3} C H_{2} C O C H_{3}

and

(C H_{3})_{2} C H M g B r

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

and

C H_{3} C H_{2} C H_{2} M g B r

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Solution

The correct option is B $(C H_{3})_{2} C H C H O$ and $(C H_{3})_{2} C H M g B r$
Option B is the correct answer.
It is evident from the given mechanism that the correct reagents are $(C H_{3})_{2} C H C H O$ and $(C H_{3})_{2} C H M g B r$ .

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