Which of the following Halogen reacts fast with alkanes in substitution reactions?
Correct answer: B. F2
- A. Cl2
- B. F2
- C. I2
- D. Br2
Explanation
'Fluorine' (F2) is the most reactive halogen as it has a small size and high charge density. Furthermore, the reactivity of group 7 elements decreases down the group.
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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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