WHICH OF THE FOLLOWING ARE ISOMERS?

A

3PGA and 2PGA

B

PGAL and DHAP

C

Glucose and Fructose

D

All of these

Isomers are two molecules with the same molecular formula but differ structurally. Therefore, isomers contain the same number of atoms for each element, but the atomic arrangement differs. 3PGA and 2PGA, PGAL and DHAP, Glucose and Fructose are isomers.
In.3PGA undergoes intramolecular rearrangement by in which phosphate group is shifted from 3rd position to 2nd position to from 2PGA.
Glucose and fructose are functional isomers. An alcoholic group is common to both glucose and fructose.
Glucose is broken down into 2 molecules of PGAL that are isomers of each other - Dihydroxyacetone phosphate (DHAP) and Glyceraldehyde.
So the correct answer is 'All of these'.