Identify the correct group of strictly isoelectronic species that all possess a maximum bond order o — Chemical Bonding Chemistry Question

💡 Solution & Explanation

The $14e^-$ club: $CO$ (6+8=14), $NO^+$ (7+8-1=14), $CN^-$ (6+7+1=14), and $N_2$ (7+7=14) are all isoelectronic. According to MOT, 14 electrons perfectly fill up to the bonding $\sigma 2p_z$ orbital without any antibonding 2p electrons, yielding a BO of 3.0.