Question

How many stereoisomers are possible in case of $3$ -chlorobutan- $2$ -ol ?

• A. $2$
• B. $6$
• C. $8$
• D. $4$

Answer 1

Answer: (D)

$4$

Answer 2

The structure of $3$-chlorobutan-$2$-ol is

$(C^{*}$= chiral carbon atom)
Since, 3-chlorobutane-2-ol contains $2$ asymmetric (chiral) carbon atoms, thus, the number of optical isomers $=2^{n}=2^{2}=4$