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  • In nucleophilic substitution reaction , order of halogens as incoming (attacking) nucleophile is : <img alt="I^{-}> Br^{-}> CI^{-}" src="https://learn.careers360.com/latex-image/?I%

In nucleophilic substitution reaction , order of halogens as incoming (attacking) nucleophile is :

I^{-}> Br^{-}> CI^{-}

The order of halogens as departing nucleophile should be:

Option: 1

Br^{-}> I^{-}> CI^{-}


Option: 2

I^{-}> Br^{-}> CI^{-}


Option: 3

CI^{-}> Br^{-}> I^{-}


Option: 4

CI^{-}> I^{-}> Br^{-}


Answers (1)

best_answer

As we know that,

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 given groups is in the order:

I -<   Br- <  Cl-

Thus, the order of halogen leaving group is:

I-  > Br- > Cl-

Hence, the option number (2) is correct.

Posted by

seema garhwal

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