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MCAT Question A Day - 1/29/14 - Answer!

In both dehydration and substitution reactions of alcohols,

A.  heating is required.
B.  only tertiary alcohols react.
C.  —OH is the leaving group.
D.  protonation usually occurs first because —OH is a poor leaving group.

The correct answer is (D). —OH is a poor leaving group. Protonation allows H2O to leave so that dehydration and substitution can occur.

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