In which of the following reactions is the product a hydrocarbon?

Identify the product $C$ in the following reaction:
$CH_{3}CH_{2}COOH$ $\xrightarrow{NaOH} A$ $\xrightarrow{NaOH, CaO, \Delta} B$ $\xrightarrow{HNO_{3}, \Delta} C$

Complete the following reactions:
$1. CH_4 + I_2 \rightleftharpoons ?$
$2. CH_3-CH_3 + Cl_2 \xrightarrow{h\nu} ?$

Which of the following shows only one monobrominated compound upon reaction with $Br_2$ in the presence of light?

Among the isomeric alkanes of molecular formula $C_{5}H_{12}$,identify the one that on photochemical chlorination yields:
$(i)$ $A$ single monochloride.
$(ii)$ Three isomeric monochlorides.
$(iii)$ Four isomeric monochlorides.

What happens when methane reacts with concentrated $HNO_3$ at high temperature?