In case of $HCl$, peroxide has no effect. Secondary carbocation is formed as it is more stable than primary carbocation.
$\begin{matrix}
O \\
|| \\
H-C-H, \\
\end{matrix}\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,O\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,||\,\,\,\,\, \\
H-C-C{{H}_{2}}-C-C-C{{H}_{3}}, \\
\end{matrix}\begin{matrix}
\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O \\
\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|| \\
C{{H}_{3}}-C-C{{H}_{2}}-C-H \\
\end{matrix}$
આલ્કેન$(A)$ શું હશે ?

${C_7}{H_8}\xrightarrow[\Delta ]{{3C{l_2}}}A\xrightarrow{{B{r_2}/Fe}}B\xrightarrow{{Zn/HCl}}C$