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CHEM
Exp. 7 Pre-Lab / Qualitative Organic Analysis
Name:_________________________________
Score:______/ 10
1. Draw reaction schemes for:
a) The reaction of acetone (2-propanone) with semicarbazide hydrochloride to form the semicarbazones.
b) The reaction of acetone (2-propanone) with 2,4-dinitrophenylhydrazine to form the hydrazone.
2. Draw the mechanism for either reaction 1a or 1b (above). (Hint: See imine formation in the text.)
3. Explain the purpose and means of interpretation of the following tests:
a) Beilstein
b) Combustion
c) Tollens
d) Semicarbazone and / or 2,4 Dinitrophenylhydrazine
4. Your unknown is believed to be a ketone since it did not produce a silver mirror during the Tollens Test.
You found the boiling point to be 1700C and so you suspect your compound is either 2,6-dimethyl-4heptanone or 2-octanone. Which derivative would you make to determine the identity of your unknown
ketone, semi-carbazone or 2,4-dinitrophenyl hydrazine. (Refer to the table on pg. 35 of your manual to answer
this question).

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