• # question_answer Which one of the following shows optical activity [NCERT 1984, 90] A) $HO-\underset{H}{\mathop{\underset{|}{\mathop{\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-COOH$ B) $C{{H}_{3}}-\underset{Cl}{\mathop{\underset{|}{\mathop{\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-COOH$ C) $C{{H}_{3}}-\underset{OH\,\,}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,\,}{\mathop{C-\,}}\,}}\,}}\,}}\,COOH$ D) $C{{H}_{3}}-\underset{Cl\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,\,\,}{\mathop{C-\,}}\,}}\,}}\,}}\,COOH$

$C{{H}_{3}}-\overset{H}{\mathop{\overset{|*}{\mathop{\underset{Cl}{\mathop{\underset{|}{\mathop{C}}\,}}\,\,}}\,}}\,-COOH$ In this structure chiral carbon atom is present since it is optical active.