Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Question Explanation:

The question examines the correctness of the assertion–reason statements regarding whether D(+)

glucose and L(–) fructose are enantiomers and whether glucose is the mirror image of fructose.

Concept :

This question is based on Enantiomers, Optical isomerism, Aldohexose vs ketohexose, Structural

isomerism

Solution :

Assertion: D(+) glucose and L(–) fructose are enantiomers → False

Enantiomers must have the same structure and differ only in spatial arrangement. Glucose and

fructose differ in their functional groups (glucose is an aldehyde, fructose is a ketone), so they are

structural isomers, not enantiomers.

Reason: Glucose molecule is mirror image of fructose molecule → False

Because of their different functional groups and carbonyl positions, glucose and fructose cannot

be mirror images of each other.

Assertion is false, but the Reason is false.

Final Answer: Option (D)