prelab 4 - Review Assessment Oxidation Submitted Name...

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Review Assessment: Oxidation Submitted 1/24/08 8:28 PM Name Oxidation Status Completed Score 140 out of 140 points Instructions Question 1 10 out of 10 points In this experiment which species is oxidized and which one is the oxidizing agent? Selected Answer: cyclohexanol, sodium hypochlorite Answer Feedback: Correct. Feedback: Sodium hypochlorite (household bleach) is the oxidizing agent which oxidizes cyclohexanol to cyclohexanone Question 2 10 out of 10 points How do you know conversion of cyclohexanol to cyclohexanone is an oxidation reaction? Selected Answer: because two hydrogen atoms are lost Answer Feedback: Correct. Feedback: Oxidation of carbon is indicated when there is an increase in the number of C-O bonds, and a decrease in the number of C-H bonds. While both compounds have just a single oxygen atom, cyclohexanol has ONE C-O bond and cyclohexanone has TWO C-O bonds. Question 3 10 out of 10 points Which of the following does NOT describe cyclohexanol: Selected Answer: extremely flammable Answer Feedback: Correct. Feedback: Cyclohexanol is an irritant. Avoid contact with skin, eyes, and clothing.Since it is a liquid, the cyclohexanol starting material can be weighted out or it can be measured by volume. Hygroscopic means that it attracts water from the air, so the reagent bottle should not be left open to the air and we should probably expect samples of cyclohexanol to be wet (meaning they contain water). ALL reagents should be properly capped after use. Question 4 10 out of 10 points True or false:This experiment is based on oxidation of a primary alcohol by the help of an oxidizing agent to produce a ketone. Selected Answer: False Feedback: A primary alcohol would have only one alkyl group (R) attached to the alcohol carbon (e.g., RCH 2 OH). Cyclohexanol is a secondary alcohol and cyclohexanone is a ketone. Question 5 10 out of 10 points Why do you prefer to use hypochlorite (household bleach) as your oxidizing agent? Selected Answer: all of the above
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Feedback: Compared to sodium dichromate (Na 2 Cr 2 O 7 ), or pyridinium chlorochromate (PCC), which contain carcinogens (chromate), the sodium hypochlorite is safer. Also, chromate is much more toxic to the environment so it requires more expensive waste disposal handling. Since hypochlorite is readily available in household bleach, it is also inexpensive.
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