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Q.
The bond length (pm) of $\ce{F_2, H_2, Cl_2}$ and $\ce{I_2}$, respectively is
TS EAMCET 2017
Solution:
Bond length $\propto$ atomic size.
Higher is the atomic size, higher is the bond length and vice versa.
Hydrogen has the lowest atomic size. Hence, $H - H$ has the lowest bond length.
Iodine has the highest atomic size. Hence, I - I has the highest bond length.
The bond length (pm) of $F _{2}, H _{2}, Cl _{2}$ and $I _{2}$, respectively is $144,74,199,267$.