The catenation tendency of C, Si and Ge is in | vedclass

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(D) The catenation tendency is directly proportional to the bond dissociation energy of the element-element bond. As the atomic size increases down th

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$348, 180, 167$

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(D) The catenation tendency is directly proportional to the bond dissociation energy of the element-element bond. As the atomic size increases down the group, the bond length increases and the bond dissociation energy decreases. The bond energies for $C-C$, $Si-Si$, and $Ge-Ge$ are approximately $348 \ kJ \ mol^{-1}$, $180 \ kJ \ mol^{-1}$, and $167 \ kJ \ mol^{-1}$ respectively. Therefore, the order of bond energies is $C-C > Si-Si > Ge-Ge$.

The catenation tendency of $C, Si$ and $Ge$ is in the order $Ge < Si < C$. The bond energies (in $kJ \ mol^{-1}$) of $C-C, Si-Si$ and $Ge-Ge$ bonds, respectively, are:

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