Which among the following are having diamagnetic property? (i) $\mathrm{B}_2$ (ii) $\mathrm{N}_2$ (iii)…
Which among the following are having diamagnetic property?
(i) $\mathrm{B}_2$
(ii) $\mathrm{N}_2$
(iii) $\mathrm{O}_2$
(iv) $\mathrm{C}_2$
- ii, iii
- i, iv
- ii, iv
- i, ii
Solution
Molecular orbital configuration for
(i) $\mathrm{B}_2(10)=\sigma 1 s^2, \sigma^* 1 s^2, \sigma 2 s^2, \sigma^* 2 s^2, \pi p_x^1 \approx \pi p_y^1$
Two unpaired electrons, paramagnetic.
(ii) $\mathrm{N}_2(14)$
$$
=\sigma 1 s^2, \sigma^* 1 s^2, \sigma 2 s^2, \sigma * 2 s^2, \pi p_x^2 \approx \pi p_y^2, \sigma 2 p_z^2
$$
No unpaired electrons, diamagnetic.
(iii) $\mathrm{O}_2(16)$
$$
\begin{aligned}
= & \sigma 1 s^2, \sigma^* 1 s^2, \sigma 2 s^2, \sigma * 2 s^2, \sigma 2 p_z^2, \pi 2 p_x^2 \approx \pi 2 \\
& \pi * 2 p_x^1, \pi * 2 p_y^1
\end{aligned}
$$
Two unpaired electrons, paramagnetic
(iv) $\mathrm{C}_2(12)$
$$
=\sigma 1 s^2, \sigma * 1 s^2, \sigma 2 s^2, \sigma * 2 s^2, \pi 2 p_x^2 \approx \pi 2 p_y^2
$$
No unpaired electron, diamagnetic.
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Asked in: JEE-TOPICTESTS-CHEMISTRY
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