Optical rotations of some compounds alongwith their structures are given below which of them have D configuration.

(a) I, II, III (b) II, III (c) I, II (d) III

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Solution

Answer: (a). I, II, III

D and L configuration are relative configurations decided by relating structure of given saccharide with D or L glyceraldehyde.

When -OH a lowest asymmetric carbon is written at the right-hand side, it is represented as D configuration and when -OH is written on the left-hand side, it is represented as L configuration.

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