Assertion: -But-1-ene on reaction with HBr in the presence of a peroxide produces 1-bromobutane.
Reason :-It involves the formation of a primary radical.

Reaction of HBr with propene in the presence of peroxide gives :-

The reaction of HBr with 1-propene in the presence of peroxides will produce primarily

The product formed when but-1-ene is subjected to HBr in the presence of peroxide is

Assertion : trans -2- Butene on reaction with Br_(2) gives meso -2,3- dibromobutane. Reason : The reaction involves syn - addition of bromine.

When HBr adds to 1-butene in the presence of benzoyl peroxide, the product obtained is

In S_(N^(1)) the first step involves the formation of

3-methyl-pent-2-ene on reaction with HBr in the presence of peroxide forms an addition product. The number of possible stereoisomers for the product is

Reaction of HBr with propene, in absence of organic peroxides, gives 1-bromopropane as the major product.

Assertion: Addition of HBr to propene yields 2-bromopropane but in presence of a peroxide it yields 1-bromopropane. Reason: When reaction is carried out in the presence of a peroxide it follows free radical mechanism, 2^(@) free radical is more stable than 1^(@) free radical.