Question
Which will have enantiomer

Answer

a
(a) $2-$chloro butane has a chiral carbon atom, hence only it will show optical activity and will possess two enantiomers (one chiral carbon atom).

$C{H_3}C{H_2} - \mathop {\mathop {\mathop {{C^ \bullet }}\limits_|^| }\limits^H - }\limits_{Cl\;} C{H_3}$

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