The majororganic product formed by the addition of HBr to the given alkenesin the presence and absence of peroxides is to be identified. Concept Introduction: > Addition of hydrogen halides to alkenes produces alkyl halides. > This addition may be electrophilic which proceeds through the formation of carbocation intermediates. > During electrophilic addition, a proton is added to the double bond such that the more stable carbocation is produced. > The overall addition is according to the Markovnikov rule. The hydrogen atoms get added to the carbon atom which has more hydrogens attached to it. > The addition of hydrogen halides to alkenes may be through the formation of free radicals as intermediates. > During free radical addition, the bromine is added to the double bond such that a more stable alkyl free radical is produced. > The overall addition takes place with a regioselectivity opposite to that of Markovnikov rule: The hydrogen atoms get added to the carbon atom which has less hydrogens attached to it.

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Chapter 10.5, Problem 11P

Interpretation Introduction

Interpretation:

The majororganic product formed by the addition of HBr to the given alkenesin the presence and absence of peroxides is to be identified.

Concept Introduction:
>
Addition of hydrogen halides to alkenes produces alkyl halides.
>
This addition may be electrophilic which proceeds through the formation of carbocation intermediates.
>
During electrophilic addition, a proton is added to the double bond such that the more stable carbocation is produced.
>
The overall addition is according to the Markovnikov rule. The hydrogen atoms get added to the carbon atom which has more hydrogens attached to it.
>
The addition of hydrogen halides to alkenes may be through the formation of free radicals as intermediates.
>
During free radical addition, the bromine is added to the double bond such that a more stable alkyl free radical is produced.
>
The overall addition takes place with a regioselectivity opposite to that of Markovnikov rule: The hydrogen atoms get added to the carbon atom which has less hydrogens attached to it.

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