JEE Advanced · 2011 · 10 Apr 2011 · Paper 2 · Biomolecules

The following carbohydrate is

(A)a ketohexose
(B)an aldohexose✓ Correct
(C)an $α$ -furanose
(D)an $α$ -pyranose

Answer: (B)

Solution

The structure shown is a six-membered cyclic form of a carbohydrate (pyranose ring) with an aldehyde functional group (at C-1 position in the open-chain form).

Since it has six carbon atoms and an aldehyde group, it is an aldohexose. The cyclic form shown is a pyranose (six-membered ring), but the question asks about the classification of the carbohydrate itself, not specifically about the anomeric configuration.

The correct answer is an aldohexose.

JEE Advanced · 2011 · 10 Apr 2011 · Paper 2 · Single correct option

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