TBR Hydrocarbon Reactions

[ajumobim]

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Passage VII #48 explanation says that the percentage of the secondary alcohol increases as temp of the hydration increases, but the secondary alcohol is formed from 1,2 addition, so shouldn't that decrease and the products of 1,4 addition increase? Don't understand why the answer is A instead of C.

 

[erythrocyte666]

No, because the temperature of the rxn is higher, the more stable product is favored --- the more stable product is the more substituted alkene.
If the temperature was lower, then you have kinetic control, and hence more stable carbocation is preferred (rearrangement is extremely fast), and hence the tertiary alcohol.