Wurtz reaction of bromoethane gives $n$-butane. Sodium salt of $X$ on heating with sodalime also results in $n$-butane. Compound $X$ is

Which of the following organic compounds will give a mixture of $1$-chlorobutane and $2$-chlorobutane on chlorination?

To prepare a pure sample of $n-$hexane using sodium metal as one reactant,the other reactant will be

Identify the major product formed in the bromination of $2-$methylpropane.

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

Pure methane can be produced by: