Which one of the following reagents is suitable for the conversion of 2-cyclohexenone into 3-methylcyclohexanone ?

C H_{3} M g I

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(C H_{3})_{2} C u L i

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C H_{2} I_{2}

and Zn

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C H_{3} A l C l_{2}

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Solution

The correct option is A $(C H_{3})_{2} C u L i$
2-cyclohexenone can be converted to 3-methylcyclohexanone by using $(C H_{3})_{2} C u L i$ (dimethyl lithium cuprate).

Net reaction is addition of molecule of methane across C=C double bond. When other reagents are added, carbonyl carbon is affected.

It is called 1,4-addition.

Option B is correct.

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R - C H_{2} - O H \to R - C H O

The most suitable reagent for the following conversion is:

P h {C H}_{2} {C H}_{3}

P h C H = {C H}_{2}

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