The correct match is

	List-I (Molecule)		List-II (Bonds)
A)	C2	P)	1, paramagnetic
B)	O2	Q)	1, diamagnetic
C)	B2	R)	2, paramagnetic
D)	Li2	S)	2, diamagnetic
		T)	3, diamgnetic

	(A)	(B)	(C)	(D)
1)	R	T	Q	P
2)	S	R	P	Q
3)	S	Q	P	R
4)	R	Q	T	S

$$\begin{gathered} C_2 : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2 \\ \mathrm{B}.\mathrm{O}=\frac{8-4}{2}=2 ; \mathrm{diamagnetic} \end{gathered}$$

$$\begin{gathered} {\mathrm{O}}_2 : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{x}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^2\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{y}}^1\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{z}}^1 \\ \mathrm{B}.\mathrm{O}=\frac{10-6}{2}=2 ; \mathrm{paramagnetic} \end{gathered}$$

$$\begin{gathered} B_2 : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2\mathrm{\sigma }*2{\mathrm{s}}^2\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}^1\mathrm{\pi }2{\mathrm{p}}_{\mathrm{z}}^1 \\ \mathrm{B}.\mathrm{O}=\frac{6-4}{2}=1 ; \mathrm{paramagnetic} \end{gathered}$$

$$\begin{gathered} L{i}_2 : \mathrm{\sigma }1{\mathrm{s}}^2\mathrm{\sigma }*1{\mathrm{s}}^2\mathrm{\sigma }2{\mathrm{s}}^2 \\ \mathrm{B}.\mathrm{O}=\frac{4-2}{2}=1 ; \mathrm{diamagnetic} \end{gathered}$$