Photochemical chlorination of alkane is initiated by a process of

Complete the following reactions:
$1$. Complete oxidation of alkane
$2$. Incomplete combustion of methane

Which alkane gives only one mono-chlorinated product?

The smallest compound,which on photochlorination produces diastereomers is

Select the chain propagation steps in the free-radical chlorination of methane.
$(1) \, Cl_2 \to 2Cl^{\bullet}$
$(2) \, Cl^{\bullet} + CH_4 \to CH_3Cl + H^{\bullet}$
$(3) \, Cl^{\bullet} + CH_4 \to CH_3^{\bullet} + HCl$
$(4) \, H^{\bullet} + Cl_2 \to HCl + Cl^{\bullet}$
$(5) \, CH_3^{\bullet} + Cl_2 \to CH_3Cl + Cl^{\bullet}$

$CH_3-CH_2-CH_2-CH_3 \xrightarrow{Br_2/hv}$
Major product in the above reaction is