Question

# 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, $$2^0$$ free radical is more stable than $$1^0$$ free radical.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C
Assertion is correct but Reason is incorrect.
D
Both Assertion and Reason are incorrect.

Solution

## The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.Due to the formation of secondary radical, it forms 1-bromopropane. It happens for peroxide reaction for $$Br_2$$ addition.Stability: $$CH_3-\overset{\bigoplus}{CH}-CH>CH_3-CH_2-\overset{\bigoplus}{CH_2}$$Stability: $$CH_3-\overset{\bullet}{CH}-CH_3> Ch_3-CH_2-\overset{\bullet}{CH_2}$$Secondary carbon having radical or cation is having more hyperconjugation, so more stable. Chemistry

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