Question

Bond energy is highest for

• A. Ge-Ge
• B. C-C
• C. Sn-Sn
• D. Si-Si

Answer 1

Answer: (B)

In a group from top to bottom the strength of $M-M$ bond decreases due to increase in the size of the atom.
In the group $14$ elements $(C,Si,Ge,Sn)$, the size of the atomic radius is in the order of $Sn>Ge>Si>C$. The size of the carbon is smallest in the group therefore, bond energy is highest for $C-C$. The energies of various bonds are following