JEE Main Chemistry question
How many of the following are stereoisomers of D-glucose? (i) D-fructose (ii) D-ribose (iii) L-glucose (iv) D-galactose
Answer: 2
Solution
Stereoisomers must share the same molecular formula and sequence of bonded atoms, differing only in spatial arrangement. D-ribose has a different molecular formula (a pentose vs. glucose's hexose formula) and so is not an isomer of glucose at all; D-fructose
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