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(B) Bond dissociation energy depends on the size of the atoms and the extent of orbital overlap.$1$. For $H-H$ $(436 \ kJ/mol)$,$Cl-Cl$ $(242 \ kJ/mol

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$Si-Si > C-C > H-H$

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(B) Bond dissociation energy depends on the size of the atoms and the extent of orbital overlap.$1$. For $H-H$ $(436 \ kJ/mol)$,$Cl-Cl$ $(242 \ kJ/mol)$,and $Br-Br$ $(193 \ kJ/mol)$,the order is correct as size increases down the group,decreasing overlap.$2$. For $Si-Si$ $(226 \ kJ/mol)$,$C-C$ $(348 \ kJ/mol)$,and $H-H$ $(436 \ kJ/mol)$,the order $Si-Si > C-C > H-H$ is incorrect because $C-C$ has a higher bond energy than $Si-Si$ due to effective $2p-2p$ overlap compared to $3p-3p$ overlap.$3$. For $C-C$ $(348 \ kJ/mol)$,$N-N$ $(163 \ kJ/mol)$,and $O-O$ $(146 \ kJ/mol)$,the order is correct due to increasing lone pair repulsions.$4$. For $H-Cl$,$H-Br$,and $H-I$,the bond energy decreases as the bond length increases,so the order is correct.Thus,the incorrect order is $Si-Si > C-C > H-H$.

Which of the following represents the incorrect order of bond dissociation energy?

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