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Question

Which of the following possesses the highest bond energy?

A
F2
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B
Cl2
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C
Br2
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D
I2
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Solution

The correct option is B Cl2
F2 is a smaller molecule than Cl2. This means that the bonded electrons in F2 are closer to the outer shell unbonded electrons. Due to the electron repulsion theory, the bonded electrons repel the outer shell unbonded electrons far more in F2 than they would in Cl2.

since Cl2 has more shells so more shielding of the outer electrons. The fact that the bonded electrons in F2 repel the unbonded electrons so much makes the molecule weak, so it is easier to break.

Hence option B is correect.

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