Which of the following is most likely to show optical isomerism

  • A

    $HC \equiv C - \mathop {\mathop C\limits_|^| - }\limits_{Cl\,}^{H\,} C \equiv CH$

  • B

    $HC \equiv C - \mathop {\mathop C\limits_|^| }\limits_{Cl}^H - C{H_3}$

  • C

    $HC \equiv C - \mathop {\mathop C\limits_|^| }\limits_{Cl}^H - H$

  • D

    $HC \equiv C - \mathop {\mathop C\limits^| }\limits^{Cl} = C{H_2}$

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$\begin{array}{*{20}{c}}
H\\
|\\
{ClHC = HC - C - CH = CHCl}\\
|\\
{Cl}
\end{array}$

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