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Chapter 7: Problem 12

This section contains multiple choice questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONLY ONE is correct. Pairs of isomeric polyhydroxy aldehydes differing only in the configuration at first carbon are called (a) anomers (b) enantiomers (c) mesomers (d) epimers

Short Answer

Expert verified
The name given to pairs of isomeric polyhydroxy aldehydes that differ only in the configuration at the first carbon is (a) anomers.

Step by step solution

01

Anomers

Anomers are a special type of stereoisomers that are cyclic carbohydrate molecules, differing in the configuration at the anomeric (first) carbon. In this case, the exercise is referring to differences at the first carbon, which aligns with the definition of anomers.
02

Enantiomers

Enantiomers are a type of stereoisomers that are non-superimposable mirror images of each other. They have different configurations at all chiral centers in the molecule. The exercise specifically asks for compounds that differ only in the configuration at the first carbon, so enantiomers are not the correct answer.
03

Mesomers

Mesomers are resonance structures of the same compound that share electrons. This term is related to covalent bonding and resonance, which is not applicable to this exercise. Therefore, mesomers are not the correct answer
04

Epimers

Epimers are a type of stereoisomers that have different configurations at only one of their chiral centers. However, this exercise specifically refers to differences at the first carbon, which is a more specific situation than general epimers. Since Step 1 is the most appropriate option according to the exercise description, the correct answer is: (a) anomers

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