Which one of the following alkenes forms the same product with HBr in the absence as well as in the presence of peroxide?

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Quantrex Academy · Accepted Answer

Correct answer: A. 2-butene

Symmetrical alkenes yield the same product with HBr in the presence and absence of peroxide because both carbons of the double bond are equivalent.

2-butene (CH_3-CH=CH-CH_3

) is a symmetrical alkene.<br><br>Addition of HBr to 2-butene in the absence of peroxide (electrophilic addition) yields 2-bromobutane.<br><br>Addition of HBr to 2-butene in the presence of peroxide (free radical addition) also yields 2-bromobutane.<br><br>1-butene, propene, and 2-methylpropene are unsymmetrical alkenes and will yield different products (Markovnikov and anti-Markovnikov products) under these two conditions.<br><br>Answer: 2-butene

Which one of the following alkenes forms the same product with HBr...

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