MHT CET 2024 Chemistry question

Identify the correct decreasing order of thermal stability from following.

(A)ClF > ClI > IBr > BrClCorrect
(B)BrCl > IBr > ClI > ClF
(C)ClF > IBr > BrCl > ClI
(D)ClF > ClBr > IBr > ClF

Answer: (A)

Solution

Thermal stability of an interhalogen compound follows the strength (bond dissociation enthalpy) of its X-X' bond. ClF has by far the strongest bond (about 250 kJ/mol) because fluorine is small and highly electronegative, while the bonds of the heavier pairs are longer and weaker (BrCl about 215, ICl about 210 and IBr

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Question ID VK-092911