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Question

The strongest bond is present in:

A
Br2
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B
I2
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C
Cl2
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D
F2
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Solution

The correct option is B Cl2
As we move down a group, the size of the atom increases and its bond strength decreases.
According to this, F2 has the strongest bond, but due to the very small size of Fluorine, there is a strong electronic repulsion between its electrons which makes it weak & unstable.
Therefore, Chlorine outlooks Fluorine in this matter & has highest bond strength.

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