The major product of the reaction is to be predicted and the complete mechanism of the reaction including all initiation and propagation steps is to be drawn. Two plausible termination steps are to be drawn. Concept introduction: Halogen molecules undergo homolysis when irradiated with UV light to produce two radical atoms. Homolysis is the type of bond dissociation where each atom gets one of the bond electrons. An unpaired electron present in radical of atom or molecule. It is highly unstable, and therefore a highly reactive species. This homolytic dissociation is called initiation. Being reactive, a radical will react with other species present. This produces another radical, which can continue the reaction is a step called propagation. The reaction is generally branched as each initiation step produces two radicals. The propagation steps continue as long as radicals are present, and may be terminated by a reaction between two radicals. The reaction generally results in substitution, often of a hydrogen atom from the hydrocarbon skeleton. When there are distinct types of hydrogen atoms in the reactant, the hydrogen removed is one that will lead to the formation of the most stable radical. The relative stability of radicals changes in the same was as the stability of carbocation. This decides the major product of the reaction.

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Chapter 25, Problem 25.17P

Interpretation Introduction

Interpretation:

The major product of the reaction is to be predicted and the complete mechanism of the reaction including all initiation and propagation steps is to be drawn. Two plausible termination steps are to be drawn.

Concept introduction:

Halogen molecules undergo homolysis when irradiated with UV light to produce two radical atoms. Homolysis is the type of bond dissociation where each atom gets one of the bond electrons. An unpaired electron present in radical of atom or molecule. It is highly unstable, and therefore a highly reactive species. This homolytic dissociation is called initiation.

Being reactive, a radical will react with other species present. This produces another radical, which can continue the reaction is a step called propagation. The reaction is generally branched as each initiation step produces two radicals. The propagation steps continue as long as radicals are present, and may be terminated by a reaction between two radicals.

The reaction generally results in substitution, often of a hydrogen atom from the hydrocarbon skeleton. When there are distinct types of hydrogen atoms in the reactant, the hydrogen removed is one that will lead to the formation of the most stable radical. The relative stability of radicals changes in the same was as the stability of carbocation. This decides the major product of the reaction.

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