Match each of the diatomic molecules in Column I with its property / properties in Column II. Column I Column II (A) B_2 (p) Paramagnetic (B) N_2 (q) Undergoes oxidation (C) O_2^ - (r) Undergoes reduction (D) O_2 (s) Bond order 2 (t) Mixing of ' s ' and ' p ' orbitals

Match each of the diatomic molecules in Column I with its propert…

MCQ

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
$(A) \rightarrow p, q, r \& ~t,(B) \rightarrow p, r, s,\& ~t, (C) \rightarrow p, q, r, (D) \rightarrow p, q, r \& \ ~s$
B
$(A) \rightarrow s, t, r\& ~p,(B) \rightarrow p, r, s,\& ~t, (C) \rightarrow p, s, r, (D) \rightarrow p, q, r \& \ ~s$
C
$(A) \rightarrow q, s, r\& ~t,(B) \rightarrow p, r, s,\& ~t, (C) \rightarrow s, q, r, (D) \rightarrow p, q, r \& \ ~s$
D
$(A) \rightarrow p, s, q\& ~t,(~B) \rightarrow q, t, s,\& ~p, (C) \rightarrow p, q, r, (D) \rightarrow r, q, p \& \ ~s$

✓

Answer

$(A)$ $B_2: \sigma 1 s^2 \sigma 1 s^2 \sigma 2 s^2 \sigma 2 s^2\left|\begin{array}{l}\pi 2 p_y^1 \\ \pi 2 p_z^1\end{array}\right|$ 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