D-glucose and D-fructose are

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$C_{3}$ epimer

$C_{2}$ epimer

Functional isomers

Position isomers

answer is C.

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Detailed Solution

The structure of glucose and fructose are-

Based on the structures we can say that they are functional isomers since they have the same molecular formula but different functional groups i.e glucose has an aldehydic group while fructose has a ketonic group.

Hence option C is the correct answer.

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