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Which of the following compounds is Meso Compound?

a. 1-amino-2-methyl-1phenylpropane
b. Glyceraldehyde
c. 2,3-dichlorobutane
d. Chloroiodoethanoic acid

Answer: 2,3-dichlorobutane. Meso compound is one whose molecules are superimposable on their mirror images even though they contain chiral centers.

A meso compound is optically inactive for the same reason as any other compound whose molecules are achiral: the rotation caused by any one molecule is cancelled by an equal and opposite rotation caused by another molecule that is the mirror image of the first.

It can be easily identified by the fact that one half of the molecule is the mirror image of the other half.

meso-2-3-dichlorobutane