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Match each of the diatomic molecules in Column $I$ with its property / properties in Column $II$.
| Column $I$ | Column $II$ |
| $(A)$ $\mathrm{B}_2$ | $(p)$ Paramagnetic |
| $(B)$ $\mathrm{N}_2$ | $(q)$ Undergoes oxidation |
| $(C)$ $\mathrm{O}_2^{-}$ | $(r)$ Undergoes reduction |
| $(D)$ $\mathrm{O}_2$ | $(s)$ Bond order $\geq 2$ |
| $(t)$ Mixing of ' $\mathrm{s}$ ' and ' $\mathrm{p}$ ' orbitals |
$(A) \rightarrow p, q, r \& ~t,(B) \rightarrow p, r, s,\& ~t, (C) \rightarrow p, q, r, (D) \rightarrow p, q, r \& \ ~s$
$(A) \rightarrow s, t, r\& ~p,(B) \rightarrow p, r, s,\& ~t, (C) \rightarrow p, s, r, (D) \rightarrow p, q, r \& \ ~s$
$(A) \rightarrow q, s, r\& ~t,(B) \rightarrow p, r, s,\& ~t, (C) \rightarrow s, q, r, (D) \rightarrow p, q, r \& \ ~s$
$(A) \rightarrow p, s, q\& ~t,(~B) \rightarrow q, t, s,\& ~p, (C) \rightarrow p, q, r, (D) \rightarrow r, q, p \& \ ~s$
Solution
$(A)$ $B_2: \sigma 1 s^2 \sigma 1 s^2 \sigma 2 s^2 \sigma 2 s^2\left|\begin{array}{l}\pi 2 p_y^1 \\ \pi 2 p_z^1\end{array}\right|$ paramagnetic. Bond order
$=\frac{6-4}{2}=1$
Bond is formed by mixing of $s$ and p orbitals. $B_2$ undergoes both oxidation \& reduction as
$B_2+O_2 \xrightarrow{\text { Heat }} B_2 O_3 \text { (Oxidation) } B_2+H_2 \rightarrow B_2 H_6 \text { (Reduction) }$
$(B)$ $N_2: \sigma 1 s^2 \sigma 1 s^2 \sigma 2 s^2 \sigma 2 s^2 \sigma 2 p_x^2\left|\begin{array}{c}\pi 2 p_y^2 \\ \pi 2 p_z^2\end{array}\right|$ diamagnetic. Bond order
$=\frac{10-4}{2}=3 > 2$
$N_2$ undergoes both oxidation and reduction as
$N _2+ O _2 \xrightarrow{\Delta} NO , N _2+3 H _2 \xrightarrow{\text { Catalyst }} NH _3$
In $N_2$, bonds are formed by mixing of s and p orbitals.
$(C)$ $O_2: \sigma 1 s^2{ }_\sigma^{\star} 1 s^2 \sigma 2 s^2 \sigma 2 s^2 \sigma 2 p_x^2\left|\begin{array}{l}\pi 2 p_y^2 \\ \pi 2 p_z^2\end{array}\right|\left|\begin{array}{l}\stackrel{\star}{\pi} 2 p_y^2 \\ \stackrel{\star}{\pi} 2 p_z^1\end{array}\right| \stackrel{\star}{\sigma} 2 p_x^0$
Paramagnetic with bond order $=1.5 . O_2^{-}$undergoes both oxidation and reduction
$(D)$ $O_2: \sigma 1 s^2{ }_\sigma^{\star} 1 s^2 \sigma 2 s^2 \sigma 2 s^2 \sigma 2 p_x^2\left|\begin{array}{l}\pi 2 p_y^2 \\ \pi 2 p_z^2\end{array}\right|\left|\begin{array}{l}\stackrel{\star}{\pi} 2 p_y^1 \\ \stackrel{\star}{\pi} 2 p_z^1\end{array}\right| \stackrel{\star}{\sigma} 2 p_x^0$
Paramagnetic with bond order $=2 . O _2$ undergoes reduction and oxidation
