1-pentene reacts with HCl in presence of benzoyl peroxide to give-----as major product.

H-Cl bond enthalpy is very high. Peroxide cannot break HCl into free radicals. Thus ionic mechanism is followed.CH3-CH2-CH2-CH=CH2→H+CH3-CH2-CH2-C+H-CH2more stable ; CH3-CH2-CH2-C+H-CH2more stable →Cl-CH3-CH2-CH2-CHCl-CH2major ;