The number of optically active isomer observed in 2,3 -dichlorobutane is

Options

A. 0
B. 2
C. 3
D. 4

Answer

B

Explanation

`underset("total optical isomers=3")(CH_(3)-overset(Cl)overset(|)(CH)-overset(Cl)overset(|)(CH)-CH_(3))`

(ii) and (iii) are optically active.