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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 BCl2
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.