Which of the following has highest bond energy?

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$I_{2}$

$\begin{aligned} F_{2} \end{aligned}$

$\begin{aligned} {Cl}_{2} \end{aligned}$

${Br}_{2}$

answer is B.

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Detailed Solution

Chlorine has highest bond energy. The order of bond energy is, ${Cl}_{2} > {Br}_{2} > F_{2} > I_{2}$

The atomic size increases and, thus, the bond length likewise increases as one proceeds down the halogen group from chlorine to iodine.

Additionally, when bond length grows, less energy is needed to break bonds

Hence Chlorine has highest bond energy.

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