Q.

Which one is not a D-sugar?

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a

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b

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c

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d

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answer is A.

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Detailed Solution

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In the correct fischer projection from bottom, on the first chiral carbon atom, if the most electronegatve atom is on right side, it is D-configuration and if it is on the left side, it is L- configuration.
(1) L-Sugar, as -OH group is on left hand side. (2), (3) and (4)-D-sugars as OH group is on right hand side.

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