Question

Predict the number of stereoisomers (optical isomers) in $OHC{H}_2(CHOH{)}_{4}CHO.$

• A. 16
• B. 8
• C. 4
• D. 2

Answer 1

The correct option is A 16

Terminal groups are different.
When the molecule has no symmetry, total no. of optical isomers = $2^n$
where n is number of asymmetrical carbon atom

The number of asymmetric C atoms are four.

Therefore, the number of stereoisomers (optical isomers) is
$2^n=2^4=16$