CHM 2211L Final Exam SPG 2017 Name Moore 1. which solvent is responsible for the

Question

CHM 2211L Final Exam SPG 2017 Name Moore 1. which solvent is responsible for the organic layer to beat the bottomlayer of an extraction instead of being at the top layer? a. methanol B, concentrated sulfuric acid Ed hloromethane e, saturated sodium chloride 2. What is an indication that a sample is dry using magnesium sulfate? a white crystals will appear b, magnesium sulfate swirls c. magnesium sulfate clumps together d. drying agent is has a dull look no white crystals. 3 What is an indication that a sample is not completely dry using magnisum sulfate? b, magnesium sulfate swirls a. white crystals will appear c ium sulfate clumps together d drying agent is has a dull look no white crystals. 4. What is an indication that a sampleis completely dry using sodium sufate? b. magnesium sulfate swirls a. white crystals will appear c, magnesium sulfate clumps together d. drying agent is has a dull look no white crystals. 5. What is an indication that a sample is not dry using sodium sulfate b. magnesium sulfate swirls a. white crystals will appear c. magnesium sulfate clumps together d. drying agent is has a dull look no white crystals. 6. What is the reason that saturated sodium chloride is added to a separatory funnel when extracting an organic compound. a. salting out b. drying agent c. dissolving unreacted starting material d. neutralizer

Explanation / Answer

1. c) Dicholoromethane

2. b) MgSO4 swirls

3. c) MgSO4 clumps together

4. b)

5.c)

6. a) salting out

7.c) Cyclohexanol -----------> Cyclohexanone (CrO3 oxidation)

8.b) environmental hazard

9.c) it is exothermic

10. d) 1700-1800

11. a) 3000-3500 will not be present

13. b) a and d

14. a) alcohol and acid

15.b)

16. Labelling of protons:

C-1 (methyl)- singlet at ~2.15 ppm (3H, s)

C-3 (methylene)- triplet at ~2.4 ppm (2H, t)

C-4 (methylene)- sextet at ~1.8 ppm (2H, sextet)

C-1 (methyl)- triplet at ~0.9 ppm (3H, t)

17.

Labelling

C1 and C3- (methyls)- doublet at ~0.9 ppm (6H, d)

C-2 multiplet at ~1.65-1.95 ppm (1H, m)

C-4 methylene doublet at ~3.4 ppm (2H, d)

Alcohol proton (OH) at broad or singlet at ~3.9 ppm (1H, br or s ).

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