NEETChemistryHydrocarbons
Assertion (A) Propene on addition with hydrogen bromide in the presence of peroxide gives 1-bromopropane as the major product. Reason (R) l-bromopropane is the major product because it is formed through the stable carbocation. The correct answer is
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
Addition of HBr to propene is an example of an electrophilic addition reaction. The electrophile attacks the double bond to form 1^ and 2^ carbocations, and since 2^ carbocation is more stable the major product of the reaction is 2-bromopropane. The reaction follows Markownikoff's rule, but in the presence of per-oxide if follows anti-Markownikoff's rule and gives 1-bromopropane.