Question

The number and type of bonds between two carbon atoms in calcium carbide are:

• A. One $\sigma$, one $\pi$
• B. One $\sigma$, two $\pi$
• C. Two $\sigma$, one $\pi$
• D. None of these

Answer 1

Answer: (B)

One $\sigma$, two $\pi$

$Ca{C}_2⟶{Ca}^{2+}{[C\equiv C]}^{2-}$
$Ca{C}_2$ contains one sigma bond and two pi bonds.