Ketones generally do not form acetals, however, they readily form acetals from 1,2- and 1,3-diols in the presence of acid. Which statement explains this?单项选择题

A

The acetal that forms creates a 5- or 6- membered ring

B

the R groups of the alcohol donate electrons by hyperconjugation, stabilizing the tetrahedral intermediate

C

The p orbitals of the acetal oxygens overlab more effectively than in a general acetal of a ketone

D

The acetal that forms is resonance-stabilized

E

the reaction is catalyzed by hydronium

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Acetals form in ___________________ conditions.

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