Question

According to molecular orbital theory, $C_2$ molecule has :

• A. 1 $\sigma$ aid 1 $\pi$ bond
• B. only 2 $\sigma$ bonds
• C. only 2 $\pi$ bonds
• D. 1 $\sigma$ and 2 $\pi$ bonds

Answer 1

The correct option is A 1 $\sigma$ aid 1 $\pi$ bond

According to molecular orbital theory, $C_2$ molecule has 1 $\sigma$ aid 1 $\pi$ bond.

The M.O. electronic configuration is $KK\sigma 2s^2{\sigma }^{\ast }2s^2\pi 2p_x^2\pi 2p_y^2$

Bond order $=\frac{6-2}{2}=2$