The reaction of an alkyl halide with moist $Ag_2O$ yields..............

$3-$methylpentan$-3-$ol will be prepared from

Ethyl magnesium bromide reacts with acetone to give $X$. On hydrolysis,$X$ forms:

An alcohol,$X$ $(C_5H_{12}O)$ in the presence of $Cu / 573 \ K$ gives $Y$ $(C_5H_{10})$. The reactants required for the preparation of $X$ are

In the following sequence of reactions,the compound $D$ is
$CH_3CH_2OH$ $\xrightarrow{P + I_2} A$ $\xrightarrow[{ether}]{Mg} B$ $\xrightarrow{HCHO} C$ $\xrightarrow{H_2O} D$

$3, 3-$Dimethyl$-2-$butanol cannot be prepared by:
Choose the correct answer from the options given below :