What does “Nucleophilic substitution” actually mean in Haloalkanes & Haloarenes, and why does it matter for JEE?
a nucleophile replaces the halogen; it can go by SN1 (two steps, via a carbocation) or SN2 (one step, backside attack).
In simple words: a nucleophile replaces the halogen; it can go by SN1 (two steps, via a carbocation) or SN2 (one step, backside attack). Getting Nucleophilic substitution clear matters because JEE questions on Haloalkanes & Haloarenes usually test this idea directly, not just a formula you memorised.
Key point
Nucleophilic substitution
Common mistake
assuming every substrate reacts by the same mechanism.
Memory tip
3° favours SN1; 1° favours SN2; solvent and nucleophile decide too.
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