Question

Number and type of bonds between two carbon atoms in $Ca{C}_2$ are:

• A. one sigma $\left(\sigma \right)$ and one pi $\left(\pi \right)$ bond
• B. one $\sigma$ and two $\pi$ bonds
• C. one $\sigma$ and one and a half $\pi$ bond
• D. one $\sigma$ bond

Answer 1

Answer: (B)

one $\sigma$ and two $\pi$ bonds

A single bond between two atoms is always considered as sigma bond.

A double bond between two atoms is always considered as one sigma and one pi bond

A triple bond between two atoms is always considered as one sigma bond and two pi bonds.

So, according to the given structure $Ca{C}_2$, the two carbon atoms have 1 sigma and 2 pi bonds. Hence, option B is correct.