Symbol D stands for :

Dextrorotatory, which rotates P.P.L towards right.

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Dextrorotatory, which rotates P.P.L towards left.

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Relative configuration with respect to lactic acid taken as standard.

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Relative configuration with respect to glyceraldehyde taken as standard and (OH) group is on the right side.

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Solution

The correct option is D Relative configuration with respect to glyceraldehyde taken as standard and (OH) group is on the right side.
In the relative configuration, glyceraldehyde is taken as a standard reference compound.

The accepted convention is: if the OH group is at the right side with aldehyde group at the top, the compound belongs to D-series.

Option D is correct.

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