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(A) $1$. The reaction of cyclohexylmagnesium chloride with $CO_2$ followed by acidic hydrolysis $(H^ )$ yields cyclohexanecarboxylic acid $(A)$.$2$. C

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Cyclohexanamine

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(A) $1$. The reaction of cyclohexylmagnesium chloride with $CO_2$ followed by acidic hydrolysis $(H^ )$ yields cyclohexanecarboxylic acid $(A)$.$2$. Cyclohexanecarboxylic acid reacts with $NH_3$ upon heating $(\Delta)$ to form cyclohexanecarboxamide $(B)$.$3$. The reaction of cyclohexanecarboxamide with $Br_2$ and $NaOH$ is the Hoffmann bromamide degradation reaction,which converts the amide into a primary amine with one less carbon atom.$4$. Therefore,the product $C$ is cyclohexanamine.

In the below given synthetic sequence,the product "$C$" is

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