${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{C}{\mathrm{H}}_2\underset{\mathrm{Peroxide}}{\overset{\mathrm{HCl}}{\to }}\mathrm{A}\underset{\mathrm{dry}\mathrm{ether}}{\overset{\mathrm{Na}}{\to }}\mathrm{B}.$ ‘A’ and ‘B’ in the above sequence of reactions are respectively

HCl does not show peroxide effect and even in the presence of peroxide it follows Markovnikov's rule.

${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2+\mathrm{HCl}\stackrel{\mathrm{peroxide}}{\to }\underset{\mathrm{A}}{{\mathrm{CH}}_3-\mathrm{CH}\left(\mathrm{Cl}\right)-{\mathrm{CH}}_3}$

Two molecules of A undergoes Wurtz reaction in the presence of Na/ether and forms a long chain of alkane

$2{\left({\mathrm{CH}}_3\right)}_2\mathrm{CHCl} \stackrel{\mathrm{Na}/\mathrm{dry} \mathrm{ether}}{\to } \underset{\mathrm{B}}{{\left({\mathrm{CH}}_3\right)}_2\mathrm{CH}-\mathrm{CH}{\left({\mathrm{CH}}_3\right)}_2}+2\mathrm{NaCl}$