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(C) The given reaction is a Wittig reaction,where a ketone reacts with a phosphorus ylide $(Ph_3P=CH_2)$ to form an alkene. In this reaction,the oxyge

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Methylenecyclohexane

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(C) The given reaction is a Wittig reaction,where a ketone reacts with a phosphorus ylide $(Ph_3P=CH_2)$ to form an alkene. In this reaction,the oxygen atom of the cyclohexanone is replaced by the $=CH_2$ group from the ylide,resulting in the formation of methylenecyclohexane as the major product $A$ along with triphenylphosphine oxide $(Ph_3P=O)$ as a byproduct.

The major product $A$ is:

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The reaction shown below is:
$CH_3CH_2COCH_2CH_3 \xrightarrow{Zn-Hg/HCl} CH_3CH_2CH_2CH_2CH_3$

The product $A$ in the following reaction is:

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