Microsoft Word - procedure

1.) What is the purpose of making derivatives of unknowns?

2.) Give three reasons why acetone might interfere with your results.

3.) An unknown sample does not react with 2,4-dinitrophenylhydrazine reagent, but a color change is observed on reaction with ceric nitrate reagent. Draw the structure of a compound that would give this result.

4.) An unknown sample produces a precipitate upon reaction with 2,4-dinitrophenylhydrazine reagent. Draw the structure of a compound that would give this result.

5.) The unknown in question 4 causes Schiff's reagent to turn a magenta color. Draw the structure of a compound that would give this result.

6.) An unknown sample produces a reddish precipitate upon reaction with 2,4-dinitrophenylhydrazine reagent, no color change with Schiff's reagent, and a yellow precipitate when mixed with iodine and base. Draw the structure of a compound that would give this result.

7.) Using chemical tests how would you distinguish among 1-pentanol, 2-pentanone, 3-pentanone, and pentanal?

8.) Draw the 1H NMR spectrum of 2-pentanone. Include chemical shifts, splittings, and areas of signals