JEE Main · 2015 · 04 Apr 2015 · Offline · p-Block Elements

Which among the following is the most reactive?

(A) $Br_{2}$
(B) $I_{2}$
(C)ICl✓ Correct
(D) $Cl_{2}$

Answer: (C)

Solution

Interhalogen compounds are generally more reactive than the halogens they are built from, and

ICl

is the clearest case here. Because iodine and chlorine differ in electronegativity, the

I - Cl

bond is polar and weaker than the nonpolar

I - I

Cl - Cl

bonds, so it cleaves more readily and the molecule attacks other species more easily. That weaker, polarised bond makes

ICl

the most reactive of the set.

JEE Main · 2015 · 04 Apr 2015 · Offline · Single correct option

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