p-Block elementsHard

Question

Which of the following possess the highest bond energy ?

Options

A.F2
B.Cl2
C.Br2
D.I2

Solution

The X − X bond disassociation enthalpies from chlorine onwards show the expected trend : Cl − Cl > Br − Br > F − F > I − I. The reason for the smaller enthalpy of dissociation of F2 is the relatively larger electrons-electrons repulsion among the lone pairs in F2 molecule where they are much closer to each other than in case of Cl2.

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