What happens when $CCl_4$ is treated with $AgNO_3$?

Identify the product of the following reaction.

$1,2-dichlorocyclopentane$ $\xrightarrow{1 \text{ equivalent } Mg, \text{ ether}} X$ $\xrightarrow{D_2O} Y;$
$Y$ is:

Consider the following reaction. Which of the following bases will give the best yield of the alkene $(II)$ as the major product?

Addition of $KI$ accelerates the hydrolysis of primary alkyl halides because

Identify the major product $C$ in the given sequence of reactions.
$(CH_3)_2C=O$ $\xrightarrow[(ii) H^+/H_2O]{(i) CH_3MgBr/Ether} A$ $\xrightarrow[\Delta]{SOCl_2} B$ $\xrightarrow[\Delta]{CH_3ONa} C$