The structure of the adduct can be determined on the basis of electrophilic addition of the reagent NO+Cl− to the alkene. The reaction proceeds in accordance with Markovnikov’s rule, where in, the negative part (i.e., Cl−) of the reagent is added to the carbon atom having lesser number of hydrogen atoms and the positive part goes to the carbon having more number of hydrogen atoms. CH3−CH=CH2+NOCl → CH3−