DEHYDRATION OF ALCOHOLS Orgo Lab Please help! Will rate!! Due tomorrow 1. What i

Question

DEHYDRATION OF ALCOHOLS

Orgo Lab

Please help! Will rate!! Due tomorrow

1. What is the function of the acid catalyst in promoting the dehydration of alcohols?

2. Why would concentrated hydrochloric acid be an inappropriate catalyst for the dehydration of alcohols?

3. Why is the formation of substitution products involving displacement of water by attack of bisulfate upon a protonated alcohol not a reaction of concern in the elimination reaction?

4. Why is there an upper limit to the temperature at which the alkene(s) is (are) to be collected?


ALL Lab found here : http://imgur.com/a/2oCHu

Explanation / Answer

1. acid catalyst protonate the -OH group to -OH2+ and it becomes a good leaving group and leaves the molecule.

2. Because you can end up with a nucleophilic substitution instead of an elimination reaction. The hydrochloric acid will protonate the hydroxyl group, and the chloride ion (not radical) can attack the hydroxyl carbon. You will end up with a haloalkane instead of an alkene.

3. Bisulphate is a poor nucleophile compared to chloride ion. Thus substitution product is not favoured.

4. At very high temperature alkene can decomposed

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