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Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryHaloalkanes and Haloarenes1 Mark
MCQ
Aryl halide is less reactive than alkyl halide towards nucleophilic substitution because:
  • A
    Of less stable carbonium ion
  • B
    Due to large C−Cl bond energy
  • C
    Of inductive effect
  • D
    Of resonance stabilization and sp2 hybridization of C attached to halide.
✓

Answer

  1. Of resonance stabilization and sp2 hybridization of C attached to halide.

Explanation:

Aryl halide is less reactive than alkyl halide towards nucleophilic substitution because of the resonance stabilization and sp2 hybridization of C attached to halide.

Due to resonance, carbon-chlorine bond acquires partial double bond character, hence it becomes shorter and stronger, and thus, cannot be easily replaced by nucleophiles.

This effect is further enhanced by the sp2 nature of the C atom to which chlorine is attached.

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