d
\(\begin{matrix}
C{{H}_{3\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}-C-CH=C{{H}_{2}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}} \\
\end{matrix}\xrightarrow{HCl}\) \(\underset{\begin{smallmatrix}
{{2}^{o}}\,Carbocation \\
(less\,stable)
\end{smallmatrix}}{\mathop{\begin{matrix}
\,C{{H}_{3\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}-C-\overset{\oplus }{\mathop{C}}\,H-C{{H}_{3}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\,\,\,C{{H}_{3\,\,\,}}\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}}}\,\) \(\xrightarrow{1,2\,\overset{\Theta }{\mathop{C}}\,{{H}_{3}}}\underset{\begin{smallmatrix}
{{3}^{o}}\,Carbocation \\
(more\,stable)
\end{smallmatrix}}{\mathop{\begin{matrix}
\,\,\,C{{H}_{3}}\,C{{H}_{3}}\,\, \\
|\,\,\,\,\,\,\,\,\,\,|\,\,\, \\
C{{H}_{3}}-\underset{\oplus }{\mathop{C}}\,-CH-C{{H}_{3}} \\
\end{matrix}}}\,\) \(\xrightarrow{C{{l}^{\Theta }}}\begin{matrix}
\,\,\,\,C{{H}_{3}}\,\,\,C{{H}_{3\,\,\,\,\,\,\,}} \\
|\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\, \\
C{{H}_{3}}-C-CH-C{{H}_{3}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
Cl\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}\)