Question

Which among the folliowing defines meso forms of isomers?

• A. Meso form is optically inactive due to external compensation
• B. The molecules of the meso isomers are chiral
• C. It can be separated into optically active enantiometric pairs
• D. Molecule in meso form have a plane of symmetry

Answer 1

The correct option is D Molecule in meso form have a plane of symmetry

Meso forms of isomers are single compound and their molecules are achiral and hence they cannot be separated into optically active enantiometric pairs.
Molecule in meso form have a plane of symmetry due to which the optical rotations of upper and lower parts are equal and in the opposite direction which balanced internally and compound become optically inactive. this property is called internal compensation.