prelab 3 - Review Assessment: Dehydration Submitted Name...

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Review Assessment: Dehydration Submitted 1/18/08 1:50 PM Name Dehydration Status Completed Score 124 out of 124 points Instructions Question 1 10 out of 10 points In the dehydration of cyclohexanol to cyclohexene in the presence of phosphoric acid, what happens during the first distillation? Selected Answer: cyclohexene and water distill over and are collected in the receiver Feedback: After the first distillation, a second distillation can be done to get purified cyclohexene. Question 2 10 out of 10 points Consider the reaction below; what is the function of the sulfuric acid? Selected Answer: protonates the hydroxyl group Feedback: The acid can protonate the OH group to transform it into a better leaving group (water). Question 3 10 out of 10 points True or false:High theoretical yield can be achieved, using Le Chatelier s principle. Selected Answer: True Feedback: One of the goals of synthesis is having high theoretical yields (to be as close to 100% as possible). In this case, we need to alter the conditions to obtain a better yield, and the way that it is done is to use Le Chatelier's Principle. You can shift equilibrium either way by increasing the concentration of reactants or decreasing that of products. Question 4 10 out of 10 points What is the mechanism for the dehydration of cyclohexanol to cyclohexene? Selected Answer:
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prelab 3 - Review Assessment: Dehydration Submitted Name...

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