The catalyst used for the isomerisation of $n$-alkanes to branched chain alkanes is

Consider the given sequence of reactions.
$C_2H_6 + \frac{3}{2}O_2$ $\xrightarrow[\Delta]{(CH_3COO)_2Mn} X$ $\xrightarrow{NaOH} Y$
Electrolysis of aqueous solution of $Y$ gives gases $P$ and $Q$ at anode. $P$ and $Q$ are respectively.

$(A) + Cl_2 \xrightarrow{hv} \text{monochloro product}$. To maximize the yield of the monochloro product in the above reaction:

Which of the following is true for the given reaction $R-H + X_2 \xrightarrow{hv} R-X + H-X$?

Complete the following reactions:
$(i)$ $n$-heptane $\xrightarrow[773 \ K, 10-20 \ atm]{Cr_2O_3/V_2O_5/Mo_2O_3}$ ?
(ii) $CH_4 + O_2 \xrightarrow[523 \ K, 100 \ atm]{Cu}$ ?

$n$-Propyl chloride reacts with sodium metal in dry ether to give: