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According to my understanding, the rds in acid catalysed dehydration is the removal of the hydroxy group. If that’s the case, shouldn’t ‘3’ have a more stable intermediate (i know resonance of carbocation and a C=O isn’t good but it’s got to be better than an isolated carbocation{correct me if I’m wrong}).

The reasoning my peers gave for ‘4’ being the correct answer(which it apparently is) was that the subsequent carbanion that’s made would be more stable when conjugated with C=O. But that step shouldn’t affect anything seeing it’s not RDS right?

Sorry for the boring paragraph type question but please help me out here. Thanks a lot :D

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