Question

Markovnikov’s rule:

Alkenes undergo electrophilic addition reactions. They are triggered by the acid acting as an electrophile toward the π-electrons of the double bond.

Markovnikov’s rule states that when an unsymmetrically substituted alkene reacts with a hydrogen halide, the hydrogen atom adds to the carbon that has a greater number of hydrogens, e.g.,


Which given substrate is the most reactive toward Markovnikov’s addition?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

Presence of electron donating groups adjacent to the double bond increases the reactivity towards markonikov's addition.

Hence, (b) is the most reactive