The reaction mechanism of alkanes with halogens is known as;
Correct answer: B. Free radical substitution
- A. Propagation
- B. Free radical substitution
- C. Addition
- D. Elimination
Explanation
The correct answer is 'Free radical substitution.' This mechanism involves the substitution of hydrogen atoms in alkanes with halogen atoms through a free radical process initiated by UV light. The process is characterized by three steps: initiation, propagation, and termination. Propagation is only one part of this larger mechanism, not the mechanism itself. Addition reactions are not applicable to alkanes with halogens as they have no double or triple bonds. Elimination reactions involve the formation of double bonds, which is not the case in the halogenation of alkanes.
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About Free Radical Substitution
Free radical substitution explains how alkanes react with halogens under ultraviolet light or heat through initiation, propagation and termination steps. The mechanism involves homolytic bond fission and radical intermediates, while product formation depends on the relative stability of radicals and differs from ionic substitution.
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