Markovnikov addition takes place with unsymmetrical alkenes. The positive part of the reagent gets connected to the double bonded carbon with more number of hydrogens. In presence of peroxide and in special cases addition takes place against Markovnikov rule.
Addition of HCl or HI does not take place against ,Markoņikoff even in presence of peroxide, The reason is

Options

A. HCl & HI dissociate into `H^(+)` and `X^(-)` only.
B. The reaction with these reagents is reversible
C. One of the propagation steps is endothermic with these reagents
D. Both propagation steps are endothermic

Answer

C

Explanation

Propoagation stage (overall 3rd stage) during addition of HI and propagation stage -2 (ie overall 4th stage) during addition of HCl are endothermic