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/A) $(i)$ $n$-heptane undergoes aromatization in the presence of $Cr_2O_3$,$V_2O_5$,or $Mo_2O_3$ at $773 \ K$ and $10-20 \ atm$ to form toluene $(C_6H_5CH_3)$:
$C_7H_{16} \xrightarrow[773 \ K, 10-20 \ atm]{Cr_2O_3/V_2O_5/Mo_2O_3} C_6H_5CH_3 + 4H_2$
(ii) Methane undergoes controlled oxidation in the presence of copper catalyst at $523 \ K$ and $100 \ atm$ to form methanol:
$2CH_4 + O_2 \xrightarrow[523 \ K, 100 \ atm]{Cu} 2CH_3OH$