• # question_answer How many chiral isomers can be drawn from 2-bromo, 3-chloro butane [DCE 2003] A) 2 B) 3 C) 4 D) 5

2-bromo, 3-chloro-butane has 2 chiral carbon atoms, hence has ${{2}^{2}}=4$ optical isomers. $C{{H}_{3}}-\underset{H\ \,}{\overset{Br}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,-}}}\,\underset{H\ \,}{\overset{Cl\,}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,-}}}\,C{{H}_{3}}$