Question

$HOOC-CHOH-CHOH-CHOH-CHOH-CHOH-COOH$

The number of meso isomers of the given above molecule is:

Answer 1

According to the structure of the molecule,

$HOOC-(CHOH{)}_5-COOH$ is symmetrical and the number of asymmetric carbon atoms is 4.

Here middle carbon does not show chirality.

Hence, the number of meso-isomers will be

$m=2^{\frac{n}{2}-1}=2^{\frac{4}{2}-1}=2^1=2$.

Hence, the correct answer is 2