Question Detail
Question
Markovnikov's addition of HBr is not applicable to
Correct Answer
Option D is the correct answer.
Detailed Explanation
Markovnikov's rule applies to unsymmetrical alkenes where the two carbons of the double bond have different numbers of hydrogens. 2-Butene (CH3CH=CHCH3) is symmetrical, so both carbons have the same number of hydrogens. Markovnikov's rule is not needed (or applicable) because addition to either carbon gives the same product.
Hint
Which alkene is symmetrical?