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NEET2010ChemistryHaloalkanes and HaloarenesActual

The correct order of increasing reactivity of C X bond towards nucleophile in the following compounds is

Options

  1. AI < II < IV < III
  2. BII < III < I < IV
  3. CIV < III < I < II
  4. DIII < II < I < IV

Correct answer

A. I < II < IV < III

Step-by-step solution

Key Idea Alkyl halides are more reactive towards nucleophilic substitution. Reactivity depends upon the stability of carbocation intermediate formed. Among the given halides, aryl halide ( C ₆ H ₅ X ) is least reactive towards nucleophile as in it the C - X bond acquire some double bond character due to resonance. Presence of electron withdrawing groups like - NO ₂ at ortho and para positions facilitate the nucleophilic displacenent of - X of aryl halide. Among alkyl halides, 3^ halides are more reactive as compare

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