Order of the reactivity of halogens during halogenation of alkanes is:
Correct answer: D. Cl2 > Br2 > I2
- A. Cl2 > I2 > Br2
- B. Br2 > I2 > Cl2
- C. I2 > Cl2 > Br2
- D. Cl2 > Br2 > I2
Explanation
The chlorine radical is the most reactive of the among the given halogen molecules and it reacts easily with alkanes. In contrast, the iodine radical is the least reactive of the halogen radicals. In fact, it is so unreactive that it is unable to abstract a hydrogen atom from an alkane.So, (D) option is correct.
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About Alkyl Halides
Alkyl halides are named and related to their carbon-halogen structure, polarity and reactivity. The key reactions are nucleophilic substitution by SN1 and SN2 mechanisms and elimination by E1 and E2 mechanisms, including how substrate structure, nucleophile, base, solvent and temperature influence substitution versus elimination.
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