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Q.

Which of the following possesses the highest bond energy ?

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a

F2

b

Cl2

c

Br2

d

I2

answer is B.

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Detailed Solution

Bond energy of Fluorine (although F2 has smallest bond length) is less than Cl2 and Br2 due to greater interelectronic repulsions between the lone pair of electrons on F atomHalogenF-FCl-ClBr-BrI-IBond dissociation energy (kcal/mol)385745.535.5So chlorine has highest bond energy
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