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D-(-)-ribose reacts with one equivalent of phenylhydrazine to make a phenylhydrazone, and continues to react with excess phenylhydrazine until a colorful osazone is formed. Modify both structures by adding and removing bonds to give the expected product in each case. -NH-NH2 1 equiv ?? ?? -NH-NH2 ?? o-(-)-ribose excess

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CH NNHH OH OH OH OH DCri base D-Ribose phern C.1 OH 0 OH excessH OH 04 + Ph NH2 D-. (-)-r. base -아

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