Which one of the following pairs of species have the same bond order?

Consider the following species :

${\mathrm{CN}}^{+} , {\mathrm{CN}}^{-}, \mathrm{NO}$ and $\mathrm{CN}$

Which one of these will have the highest bond order?

Which is correct statement about $\mathrm{\sigma }$ and $\mathrm{\pi }$ molecular orbitals? Statements are

2.$\mathrm{\pi }$-antibonding orbitals are ungerade

3.$\mathrm{\sigma }$ antibonding orbitals are gerade

Peroxide ion______

(i) has five completely filled antibonding molecular orbitals

(ii) is diamagnetic

(iii) has bond order one

(iv) is isoelectronic with neon

Which of these are correct?