$A$ molecule which contains unpaired electrons is

The bond order and magnetic property of acetylide ion are same as that of $........$.

Which of the following molecular orbitals has two nodal planes?

Given below are two statements:
Statement $(I)$: The correct sequence of bond lengths in the following species is:
$O_2^+ < O_2 < O_2^- < O_2^{2-}$
Statement $(II)$: The correct sequence of number of unpaired electrons in the following species is:
$O_2 > O_2^+ > O_2^- > O_2^{2-}$

The bond order and the magnetic characteristics of $CN^{-}$ are

Based on the Molecular Orbital Theory,which of the following is the correct electronic configuration of the nitrogen molecular ion $N_2^+$?