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There are actuallly two isomeric 2,4-dinitrophenylhydrazones of 2-pentanone. Draw the structures of these isomers. 2-pentanone also forms a derivative on treatment with semicarbazide. Note that semicarbazine has two -NH2 groups that might react with the carbonyl of the ketone to form the semicarbazone. Explain why it reacts as shown in the attachement.

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This solution includes drawings of the chemical structures and chemical equations as well as a discussion. 100 words.

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Yes, unsymmetrical ketones can form two isomeric dinitrophenyl hydrazones (the E and Z isomers), in the same way that olefins can form E and Z isomers.

Although ...

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