Identify the product obtained when ethers are dissolved in cold concentrated sulphuric acid.

What are the major products from the following reaction?
$C_6H_5-O-CH_2-C_6H_5 + HI \xrightarrow{\text{heat}} ?$
$(I) C_6H_5I + C_6H_5CH_2OH$
$(II) C_6H_5OH + C_6H_5CH_2I$
$(III) C_6H_5OCH_2OH + C_6H_5I$
$(IV) C_6H_5OCH_2I + C_6H_5OH$

Among the compounds $I-IV$,the compound having the lowest boiling point is:

Which of the following compounds does $NOT$ undergo Williamson's synthesis?

Predict the major products of the following reaction:
$m$-methoxyphenethyl$-1-$phenylethyl ether + $HI$ (excess) $\xrightarrow{\text{heat}}$ ?

What are $X$ and $Y$ in the following reaction?