NEET2010ChemistryHaloalkanes and HaloarenesActual
The correct order of increasing reactivity of C X bond towards nucleophile in the following compounds is
Options
- AI < II < IV < III
- BII < III < I < IV
- CIV < III < I < II
- 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