Hetrogenous catalysis|stronger and weaker acid|electrophile| hydrogenation addition of H2

m-Hydroxybenzoic acid is a stronger acid than benzoic acid while p-hydroxybenzoic acid is weaker. Explain.

HBr is stronger acid than HI because of hydrogen bonding.

HBr is a stronger acid than HI because of hydrogen bonding.

HBr is a stronger acid than HI because of hydrogen bonding.

Vladimir Markovnikov rule: Alkenes undergo electrophilic addition reactions. It is triggered by the acid acting as a electrophile toward pi -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 the greater number of hydrogen, e.g., Which of the following is most reactive toward Markovnikov addition?

Vladimir Markovnikov rule: Alkenes undergo electrophilic addition reactions. It is triggered by the acid acting as a electrophile toward pi -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 the greater number of hydrogen, e.g., In which of following reactions, carbocation rearrangement is possible?