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D-glucose means dextro rotatory glucose ...

D-glucose means dextro rotatory glucose . Is is true? Why ?

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In glucose the carbon atom attached to the lowest `CH_2-OH` group is found to contain H atom on left side. So it is correlated to glyceraldehyde molecule and give D- symbol. D-glucose means not dextro rotatory glucose. D-symbol has nothing to do with optical activity of compound
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