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Reaction of HBr with propene in the pres...

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

A

3-bromo propane

B

Allyl bromide

C

n-propyl bromide

D

Isopropyl bromide

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the reaction of HBr with propene in the presence of peroxide, we will follow these steps: ### Step 1: Understand the Reactants - The reactants are propene (C3H6) and HBr (hydrobromic acid) in the presence of peroxide. - Propene has the structure: CH3-CH=CH2. ### Step 2: Identify the Reaction Type - The reaction is an addition reaction where HBr adds across the double bond of propene. - The presence of peroxide indicates that this reaction will proceed via a free radical mechanism, which is different from the usual electrophilic addition. ### Step 3: Formation of Free Radicals - In the presence of peroxide (ROOR), the peroxide undergoes homolytic fission to generate free radicals (RO•). - This step initiates the free radical mechanism. ### Step 4: Reaction of Free Radical with HBr - The generated free radical (RO•) reacts with HBr. - The bond between H and Br breaks, forming a bromine radical (Br•) and an alcohol (ROH). ### Step 5: Attack of Bromine Radical on Propene - The bromine radical (Br•) then attacks the double bond of propene. - The bromine can add to either of the carbon atoms involved in the double bond. ### Step 6: Formation of More Stable Radical - When Br• attacks, it can form either a primary or a secondary radical. The secondary radical is more stable due to hyperconjugation and inductive effects. - The secondary radical is formed when Br• attacks the carbon that is already bonded to two other carbon atoms. ### Step 7: Reaction of More Stable Radical with HBr - The more stable radical then reacts with another molecule of HBr. - This results in the formation of the final product, which is N-bromopropane (or n-propyl bromide). ### Step 8: Conclusion - The product formed from the reaction of HBr with propene in the presence of peroxide is N-bromopropane (C3H7Br). ### Final Answer - The correct answer is N-bromopropane. ---
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