$\begin{array}{1 1}(a)\;N_2,CO\;and\;NO^+\text{ have bond order 3}\\(b)\;F_2,O_2^{2-}\;and\;O_2^{2-}\text{ have bond order 1}\\(c)\;N_2,CO\;and\;NO^+\text{ are isoelectronic molecules and ions}\\(d)\;N_2,CO\;and\;NO^+\text{ are not isoelectronic molecules and ions }\end{array}$
