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99 Percentile Qs Bank for JEE MainChemistryHaloalkanes and Haloarenes

In the nucleophilic substitution reactions S N 2  or   S N 1 the reactivity of alkyl halides follows the sequence

Options

  1. AR - I   >   R - Br   >   R - Cl   >   R - F
  2. BR - Cl   >   R - F   >   R - Br   >   R - I
  3. CR - F   >   R - Cl   >   R - Br   >   R - I
  4. DR - I   >   R - F   >   R - Cl   >   R - Br

Correct answer

A. R - I   >   R - Br   >   R - Cl   >   R - F

Step-by-step solution

Nucleophilic substitution reaction depends on leaving group ability The correct order of reactivity is RI   >   RBr   >   RCl   >   RF  It is due to fact, that weaker the base, better will be the leaving group. Leaving group ability I − > Br − > Cl > F −

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