Question: what is meso compounds and diastereomers?
Answer: Achiral Diastereomers (meso-Compounds) In the case of 2,3-dihydroxybutanedioic acid, known as tartaric acid, the two chiral centers have the same four substituents and are equivalent. ... Two of these stereoisomers are enantiomers and the third is an achiral diastereomer, called a meso compound.