Question

Which of the following bonds has the highest bond energy?

• A. $C-C$
• B. $C\equiv C$
• C. $C=C$
• D. $C-H$

Answer 1

The correct option is B $C\equiv C$

Bond energy depends on the bond order i.e., the number of covalent bonds formed between two atoms.
Since, $C\equiv C$ has 3 covalent bonds, hence this bond has highest energy. Also, $C-H$ bond is stronger than $C-C$ bond because of better overlap between carbon and hydrogen $(s{p}^3-s\text{overlap})$ in $C-H$ as compared to $C-C$ bond $(s{p}^3-s{p}^3\text{overlap})$.
Hence, order becomes: $C\equiv C>C=C>C-H>C-C$.