Question

Which one is the absolutely specific term?

• A. A diastereomer
• B. An epimer
• C. An anomer
• D. None of the three

Answer 1

The correct option is D

None of the three

Since diastereomers are all those isomers which are not enantiomers, there may be more than one diastereomer of a compound. An epimer differs in the configuration of only one chiral carbon, so an epimer can be C - 2, C - 3, C - 4, etc. An anomer may be $\alpha$ - or $\beta -$; so no term is absolutely specific.