Which of the following are isomers?

3PGA and 2PGA

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PGAL and DHAP

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Glucose and Fructose

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All of these

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Solution

The correct option is D All of these
Isomers are molecules that have the same molecular formula but have a different arrangement of the atoms in space. That excludes any different arrangements which are simply due to the molecule rotating as a whole or rotating about particular bonds. For example, in respiration, 3PGA and 2PGA, PGAL and DHAP, Glucose and Fructose.
Thus, the correct answers is 'All of these.'

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