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6. Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry6. Haloalkanes and Haloarenes1 Mark
MCQ
Aryl halide is less reactive than alkyl halide towards nucleophilic substitution because
  • A
    Less stable carbonium ion
  • B
    Due to large $C - Cl$ bond energy
  • C
    Inductive effect
  • ✓
    Resonance stabilization and $s{p^2}$- hybridisation of  $C$  attached to halide
✓

Answer

Correct option: D.
Resonance stabilization and $s{p^2}$- hybridisation of  $C$  attached to halide
d
Aryl halide is less reactive than alkyl halide towards nucleophilic substitution because of the resonance stabilization and $sp ^2$ 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 $sp ^2$ nature of the $C$ atom to which chlorine is attached.

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