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The order of reactivity of alkyl halides towards nucleophile is:

Correct answer: B. RI > RBr > RCl > RF

  • A. RI > RBr > RF > RCl
  • B. RI > RBr > RCl > RF
  • C. RF > RCl > RBr > RI
  • D. RF > RBr > RCl > RI

Explanation

The alkyl halides are very reactive due to the highly polarised C - X bond with a large difference in electronegativities of carbon and halogen atoms. The order of reactivity is: iodides > bromides > chlorides > fluorides

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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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