(N/A) The chemical reactions for the preparation of products from methane $(CH_4)$ are as follows:
$(i)$ $CH_4 + Cl_2 \xrightarrow{h\nu} CH_3Cl + HCl$ (Methyl chloride)
$(ii)$ $CH_4 + O_2(g) \xrightarrow{\text{Incomplete combustion}} C(s) + 2H_2O$ (Carbon black)
$(iii)$ $CH_4 + 2O_2(g) \xrightarrow{\text{Complete combustion}} CO_2(g) + 2H_2O(l)$ (Carbon dioxide)
$(iv)$ $2CH_4 + O_2 \xrightarrow{Cu, 523 K, 100 \ atm} 2CH_3OH$ (Methanol)
$(v)$ $CH_4 + O_2 \xrightarrow{Mo_2O_3, \Delta} HCHO + H_2O$ (Methanal)
$(vi)$ & $(vii)$ $CH_4 + H_2O(g) \xrightarrow{Ni, \Delta} CO + 3H_2$ (Carbon monoxide and Dihydrogen)
$(viii)$ $CH_4 + I_2 \xrightarrow{HIO_3} CH_3I + HI$ (Methyl iodide)
$(ix)$ $CH_4 + Br_2 \xrightarrow{h\nu} CH_3Br + HBr$ (Methyl bromide)