MHT CET 2022 Chemistry question

Identify the correct decreasing order of bond dissociation enthalpy from following

(A)F – F >Cl – Cl > Br – Br > I - I
(B)Cl – Cl > F – F> Br – Br > I - I
(C)I – I > Br – Br >Cl – Cl > F - F
(D)Cl – Cl > Br – Br > F – F > I - ICorrect

Answer: (D)

Solution

Bond dissociation enthalpies of the halogen molecules (kJ mol) are Cl–Cl 242 > Br–Br 193 > F–F 158 > I–I 151. Going down the group the bond becomes longer and weaker (I–I is weakest of the heavier halogens), but F–F is anomalously low because of the

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Question ID VK-094127