Which of the following $C-H$ bonds has the lowest bond dissociation energy?

The correct order of reactivity of $(I)$,$(II)$,and $(III)$ towards addition reactions is:
$(I)$ Cyclopropane
$(II)$ Cyclobutane
$(III)$ Cyclopentane

Which free radicals are obtained on anode and cathode during electrolysis of $RCOO^{-}Na^{+}$ in Kolbe's electrolysis?

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

How many pairs of enantiomers are formed during the monochlorination of $2$-methylbutane?

Which of the following is not formed by the reaction of $Cl_2$ on $CH_4$ in sunlight?