Question

The total number of stereoisomers or the compound $2,4$-dichloroheptane is:

• A. $2$
• B. $3$
• C. $4$
• D. $6$

Answer 1

Answer: (B)

$3$

The structure of $2,4-dichloroheptane$ is

(Refer to Image)

There are $2$ chiral centres

$\therefore$ Maximum number of stereoisomers= $2^n=2^2=4$

Thus it has $3$ stereoisomers because one of its stereoisomers is meso.