JEE Main · 2023 · 29 Jan 2023 · Shift 1 · p-Block Elements

The bond dissociation energy is highest for

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

Answer: (A)

Solution

Down the halogen group the bond in

X_{2}

lengthens, so from chlorine to iodine it steadily weakens. Fluorine breaks this trend: its atoms are so small that the lone pairs on the two bonded atoms repel strongly and weaken the

F - F

bond, dropping it below those of chlorine and bromine. The resulting order of bond dissociation energy is

C l_{2} > B r_{2} > F_{2} > I_{2}

, so it is highest for chlorine.

JEE Main · 2023 · 29 Jan 2023 · Shift 1 · Single correct option

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