Question:
In nucleophilic substitution reaction, order of halogens as incoming (attacking) nucleophile is:
$I^- > \, Br^{-} > \, Cl^-$
The order of halogens as departing nucleophile should be:
In nucleophilic substitution reaction, order of halogens as incoming (attacking) nucleophile is:
$I^- > \, Br^{-} > \, Cl^-$
The order of halogens as departing nucleophile should be:
Updated On: Nov 20, 2025
- $Br^{-} >\, I^{-}>\, Cl^{-}$
- $I^{-} >\, Br^{-}>\, Cl^{-}$
- $Cl^{-} >\, Br^{-}>\, I^{-}$
- $Cl^{-} >\, I^{-}>\, Br^{-}$
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The Correct Option is B
Solution and Explanation
Since the leaving group breaks away as a base, it is easier to displace weaker bases as compared to stronger bases. Thus less basic the substituent, the more easily it is displaced. Since the basic strength of the given groups is in order.
$I-\, Br^{-}>\, Cl-$
$I-\, Br^{-}>\, Cl-$
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