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Q.

Which of the following has least bond energy?

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a

$F_{2}$

b

$H_{2}$

c

$N_{2}$

d

$O_{2}$

answer is A.

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Detailed Solution

(1) More, the electronegativity of the elements, more is the bond energy.
(2) But the repulsion of the lone pair of atoms make this factor secondary.
Hence, larger size element will have less repulsion of the lone pair between atoms of diatomic of diatomic molecules & bond energy will be greater.
$F_{2}$ will have least bond energy.

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