Number of molecules/species from the following having one unparred electron $15$. . . . . . $\mathrm{O}_2, \mathrm{O}_2^{-1}, \mathrm{NO}, \mathrm{CN}^{-1}, \mathrm{O}_2^{2-}$
$1$
$2$
$3$
$4$
The species having bond order different from that in $CO$ is
The internuclear distances in $O -O$ bonds for $O_2^+ ; O_2 , O_2^-$ and $O_2^{2-}$ respectively are
Which information obtained by electronic configuration of Molecule in $\mathrm{MO}$ ?
The difference in energy between the molecular orbital formed and the combining atomic orbitals is called
Which of the following is paramagnetic ?