An aldohexose A is either d-idose or d-gulose (see Fig. 24.3). It is found that a different aldohexose, L-(2)-glucose, gives the same aldaric acid as A. What is the identity of A?

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Н- Н- H Н CH=0 -OH HO OH Н OH -OH CH₂OH H H CH=0 H Н -OH HO -OH H ОН H CH₂OH CH=O ОН НО H HO OH -OH CH₂OH H H CH=0 H -H Н CH₂OH H ОН НО -OH H CH=O -OH HO OH H H HO H -OH CH₂OH CH=O H -ОН НО H HO OH H CH₂OH Н CH=0 -OH HO -Н HO -Н HO -OH H CH₂OH CH=0 -Н H H -ОН CH₂OH