| Aryl halides are extremely less reactive towards nucleophilic substitution due to the following reasons |
| [a] Resonance effect |
| [b] Instability of phenyl cation |
| [c] Because of possible repulsive |
Choose the correct order of reactivity towards nucleophilic substitution reaction of following compounds.  |
A) \[\operatorname{I} > II > III > IV\]
B) \[II>I>III>IV\]
C) \[\operatorname{IV}>III>II>I\]
D) \[III>IV>II>I\]
Correct Answer: C
Solution :
Compound having lower electron density have lower nucleophilic character. Lower the electron density at nucleus of compound, higher will be its reactivity towards nucleophilic substitution reaction. (IV) has four electron withdrawing group hence it has lowest electron density and highest reactivity towards nucleophilic substitution reaction.
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