The end product of the given reaction is:

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(B) $1$. The reaction of chlorocyclohexane with $Mg$ in the presence of dry ether $(Et_2O)$ forms a Grignard reagent,cyclohexylmagnesium chloride $(C_

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Cyclohexylmethanol

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(B) $1$. The reaction of chlorocyclohexane with $Mg$ in the presence of dry ether $(Et_2O)$ forms a Grignard reagent,cyclohexylmagnesium chloride $(C_6H_{11}MgCl)$,which is product $(A)$.$2$. The Grignard reagent $(A)$ then reacts with formaldehyde ($HCHO$ or $CH_2O$) followed by acid hydrolysis $(H_3O^{\oplus})$.$3$. The nucleophilic carbon of the Grignard reagent attacks the electrophilic carbonyl carbon of formaldehyde,forming an alkoxide intermediate.$4$. Subsequent protonation by $H_3O^{\oplus}$ yields the primary alcohol,cyclohexylmethanol $(C_6H_{11}CH_2OH)$,which is product $(B)$.

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