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

988912_931551_ans_075352919907409d910a3122bea241d1.PNG

Chemistry

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