Question

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

• A. 260, 297, 348
• B. 180, 167, 348
• C. 348,167,180
• D. 348, 297, 260

Answer 1

The correct option is D 348, 297, 260

Down the group, the size increases, tendency to show catenation decreases.
The more the bond energy, the more is the catenation. 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 are 348, 297, 260 respectively.
Ge has lowest bond energy, hence lowest catenation tendency.
C has highest bond energy, hence highest catenation tendency.

Hence, the correct answer is option (d).