Question

The bond length (pm) of $\mathrm{F}{}_2,\mathrm{H}{}_2,\mathrm{Cl}{}_2$ and $\mathrm{I}{}_2$, respectively is

• A. 144,74,199,267
• B. 74,144,199,267
• C. 74,267,199,144
• D. 144,74,267,199

Answer 1

Answer: (A)

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 $F_2,H_2,C{l}_2$ and $I_2$, respectively is $144,74,199,267$.