In the sequence of the following reactions $CH_3CH_2OH$ $\xrightarrow{[O]}$ $X$ $\xrightarrow{[O]}$ $CH_3COOH$,$X$ is

Benzyl chloride when oxidised by $Pb(NO_3)_2$ gives

What are $X$ and $Y$ in the following reaction sequence?
$C_5H_{12}O$ $\xrightarrow[573 \ K]{Cu} C_5H_{10}$ $\xrightarrow[\text{(ii) } Zn/H_2O]{\text{(i) } O_3} X + Y$

In which of the following reactions is ethyl phenyl ketone obtained?

The reaction in which the methyl group on a benzene ring is converted to an aldehydic group is called:

$L$ $\xrightarrow[(ii) H_3O^{\oplus}]{(i) PhMgBr} M$ $\xrightarrow{CrO_3 / H^{\oplus}} N$ $\xrightarrow{Ph_3P=CH_2} Ph_2C=CH_2$
$L$ in the above sequence of reaction is/are (where $L \neq M \neq N$)