MCQ
The optically inactive compound from the following is
  • A
    $2 -$ chloropropanal
  • B
    $2 -$ chlorobutane
  • C
    $2 -$ chloropentane
  • $2 -$ chloro $- 2-$ methylbutane

Answer

Correct option: D.
$2 -$ chloro $- 2-$ methylbutane
d
The optically inactive compound must containst achiral carbon atoms $(s)$. Option $(d)$ contains achiral carbon atom

$\underset{2-chloropropanol}{\mathop{\begin{matrix}
   \,Cl\,  \\
   |\,\,  \\
   C{{H}_{3}}-C-CHO  \\
   |\,\,  \\
   H\,  \\
\end{matrix}}}\,$ $\underset{2-chlorobu\tan e\,(chiral)}{\mathop{\begin{matrix}
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Cl  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,  \\
   C{{H}_{3}}-C{{H}_{2}}-C-C{{H}_{3}}  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,H  \\
\end{matrix}}}\,$ 

$\underset{(chiral)}{\mathop{\underset{2-chloropen\tan e}{\mathop{\begin{matrix}
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Cl  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|  \\
   C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C-C{{H}_{3}}  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,H  \\
\end{matrix}}}\,}}\,$ $\underset{(achiral)}{\mathop{\underset{2-chloro-2-methylbu\tan e}{\mathop{\begin{matrix}
   C{{H}_{3}}  \\
   |  \\
   C{{H}_{2}}-C-C{{H}_{3}}  \\
   |  \\
   Cl  \\
\end{matrix}}}\,}}\,$

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