AP EAMCET201825 Apr 2018Morning ShiftChemistryHydrocarbonsActual
Assertion ( A ) : Propene on addition with hydrogen bromide in the presence of peroxide gives 1 - Bromopropane as the major product Reason ( R ) : 1 - Bromopropane is the major product because it is formed through the stable carbocation
Options
- A( A ) and ( R ) are correct, ( R ) is the correct explanation of ( A )
- B( A ) and ( R ) are correct but ( R ) is not the correct explanation of ( A )
- C( A ) is correct but ( R ) is not correct
- D( A ) is not correct but ( R ) is correct
Correct answer
C. ( A ) is correct but ( R ) is not correct
Step-by-step solution
When HBr is added to propene, in the presence of benzoyl peroxide, the reaction yields 1 - bromopropane, accordance with anti Markovnikov's rule. The reaction proceeds through free radical mechanism. Addition of HBr to propene yields 2 - bromopropane, accordance with Markovnikov's rule. The reaction proceeds through ionic mechanism and involves formation of carbocation intermediate. Secondary carbocation is more stable than primary carbocation and is preferentially formed.