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Organic Chemistry

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Alkenes

Question
10 out of 15
 

In the acid-catalyzed dehydration of alcohols to alkenes, which of the following are true?

I) A carbanion intermediate is involved.

II) A carbocation intermediate is involved.

III) There is no intermediate involved.

IV) Methyl shifts can occur in the interme-diates.

V) Hydride shift can occur in the intermediates.



A I, IV & V only
B II, IV & V only
C III only
D II & V only
Ans. B Rearrangement is possible in acid-catalyzed dehydration of alcohols. The intermediate is a carbocation, not a carbanion. This eliminates statements I and III. Depending on the type of alcohol, the rearrangement may involve either methyl shift or hydride shift.

Alkenes Flashcard List

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