At 
, which substrate undergoes electrophilic addition with 
at the highest rate?
Text Solution
Verified by ExpertsThe correct answer is:
A
Reason: Electrophilic addition is fastest for alkenes that form the most stabilized carbocation. An enol ether (-OR) donates by resonance, giving an oxocarbenium intermediate far more stabilized than the tertiary carbocation from 2-methylpropene → highest rate.
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