Question

Meso isomers are possible when the organic compound contains:

• A. one asymmetric carbon
• B. two or more dissimilar asymmetric carbons
• C. similar asymmetric carbons
• D. unsaturation

Answer 1

The correct option is C similar asymmetric carbons

Meso tartaric acid has teo optical centers or two asymmetric carbon atoms but is still optically inactive due to the plane of symmetry present inside the molecule.
The optical rotation caused by one side of the molecule is cancelled by the other side.
So, it has zero optical rotation.