Question

Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is

• A. $B_2$
• B. $B{e}_2$
• C. $C_2$
• D. $N_2$

Answer 1

The correct option is C $C_2$

$B{e}_2=\sigma 1s^2{\sigma }^{\ast }1s^2\sigma 2s^2{\sigma }^{\ast }2s^2$
$B_2=\sigma 1s^2{\sigma }^{\ast }1s^2\sigma 2s^2{\sigma }^{\ast }2s^2\sigma 2p_z^2$
$C_2=\sigma 1s^2{\sigma }^{\ast }1s^2\sigma 2s^2{\sigma }^{\ast }2s^2\sigma 2p_z^2{\pi }^2{p}_x^1\pi 2p_y^1$
$N_2=\sigma 1s^2{\sigma }^{\ast }1s^2\sigma 2s^2{\sigma }^{\ast }2s^2\sigma 2p_z^2{\pi }^2{p}_x^2{\pi }^2{p}_y^2$