If both Statement-I and Statement-II are true, and Statement-II is the correct explanation of Statement-I.

If both Statement-I and Statement-I are true but Statement-II is not the correct explanation of Statement-I.

If Statement-I is true but Statement-II is false.

If Statement-I is false but Statement-II is true. (i) Statement I : 1-Butene on reaction with HBr in the presence of peroxide produces 1-bromobutane. Statement II : It involves the formation of a primary radical. (ii) Statement I : The boiling point of n-alkenes increases with increase in number of carbon atoms. Statement II : Van der Waals force of attraction increases with increase in number of carbon and molecular mass. (iii) Statement I : Addition of HBr to 1-butene gives two optical isomers. Statement II : The product contains one asymmetric carbon.