How many chiral stereoisomers can be drawn for 2 - bromo - 3 - chlorobutane ?

Options

A. 2
B. 3
C. 4
D. 5

Answer

C

Explanation

2-bromo-3-chloro-butane has 2 chiral carbon atoms, hence has `2^2 = 4` optical isomer.
`CH_(3) - overset(Br)overset(|)underset(H) underset(|)(C ) - overset(Cl)overset(|) underset(H)underset(|) ( C) - CH_(3)`