(A) The structure of $2$-chlorobutane is $CH_3-CHCl-CH_2-CH_3$.It contains one chiral carbon atom (indicated by an asterisk).For a molecule with $n$ c

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(A) The structure of $2$-chlorobutane is $CH_3-CHCl-CH_2-CH_3$.It contains one chiral carbon atom (indicated by an asterisk).For a molecule with $n$ chiral centers and no internal plane of symmetry,the number of optical isomers is given by $2^n$.Here,$n = 1$,so the number of optical isomers $= 2^1 = 2$.These two isomers are a pair of enantiomers.