An optically active aldotetrose which retains its optical activity with aqueous Br2 but loses it with conc. HNO3 has the following structure:
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Glyceraldehydes B and D lose their optical activity when oxidized by HNO3
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Studying the given elements, we find that the elements B and D will lose their optical activity when they react with HNO3, but not with aqueous Br2. B and D are glyceraldehydes. Br2 oxidizes -CHO group to -COOH group with HNO3 causing the element to lose its optical activity.
With A and C, there is symmetry and hence they are not oxidized. So they retain their optical activity.
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