JEE Main 20248 AprilEvening Shift
- Exam
- JEE Main
- Year
- 2024
- Date
- 8 April
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- Chemical Bonding and Molecular Structure
JEE Main 2024 · 8 April · Evening Shift · Chemistry · Chemical Bonding and Molecular Structure
Number of molecules having bond order 2 from the following...
Number of molecules having bond order 2 from the following molecules is ________ (\mathrm{C}_2, \mathrm{O}_2, \mathrm{Be}_2, \mathrm{Li}_2, \mathrm{Ne}_2, \mathrm{~N}_2, \mathrm{He}_2)
Correct answer
0
Step-by-step solution
\begin{aligned} & \mathrm{C}_2 \\ & \left(12 \mathrm{e}^{-}\right): \sigma 1 \mathrm{ s}^2, \sigma^* 1 \mathrm{ s}^2, \sigma 2 \mathrm{ s}^2, \sigma^* 2 \mathrm{ s}^2\left[\pi 2 \mathrm{p}_{\mathrm{x}^2=\pi 2 \mathrm{p}_{\mathrm{y}^2\right] \\ & \text{ B.O. }=\frac{8-4}{2}=2 \\ & \mathrm{O}_2 \\ & \left(16 \mathrm{e}^{-}\right): \sigma 1 \mathrm{ s}^2, \sigma^* 1 \mathrm{ s}^2, \sigma 2 \mathrm{ s}^2, \sigma^* 2 \mathrm{ s}^2, \sigma 2 \mathrm{pz}^2 \\ & {\left[\pi 2 \mathrm{p}_{\mathrm{x}^2=\pi 2 \mathrm{p}_{\mathrm{y}^2\right]\left[\pi * 2 \mathrm{p}_{\mathrm{x}^1=\pi * 2 \mathrm{p}_{\mathrm{y}^1\right]} \\ & \text{ B.O. }=\frac{10-6}{2}=2 \\ & \text{ Be }{ }_2 \\ & \left(8 \mathrm{e}^{-}\right): \sigma 1 \mathrm{ s}^2, \sigma^* 1 \mathrm{ s}^2, \sigma 2 \mathrm{ s}^2, \sigma^* 2 \mathrm{ s}^2 \\ & \text{ B.O. }=\frac{4-4}{2}=0 \\ & \mathrm{Li}_2 \\ & \left(6 \mathrm{e}^{-}\right): \sigma 1 \mathrm{ s}^2, \sigma^* 1 \mathrm{ s}^2, \sigma 2 \mathrm{ s}^2\end{aligned}\begin{aligned} & \text{ B.O. }=\frac{4-2}{2}=1 \\ & \mathrm{Ne}_2 \\ & \left(20 \mathrm{e}^{-}\right): \sigma 1 \mathrm{ s}^2, \sigma^* 1 \mathrm{ s}^2, \sigma 2 \mathrm{ s}^2, \sigma^* 2 \mathrm{ s}^2, \sigma 2 \mathrm{pz}^2 \\ & {\left[\pi 2 \mathrm{p}_{\mathrm{x}^2=\pi 2 \mathrm{p}_{\mathrm{y}^2\right]\left[\pi * 2 \mathrm{p}_{\mathrm{x}^2=\pi^* 2 \mathrm{p}_{\mathrm{y}^2\right] \sigma^* 2 \mathrm{p}_{\mathrm{z}^2} \\ & \text{ B.O. }=\frac{10-10}{2}=0 \\ & \mathrm{ N}_2 \\ & \left(14 \mathrm{e}^{-}\right): \sigma 1 \mathrm{ s}^2, \sigma^* 1 \mathrm{ s}^2, \sigma 2 \mathrm{ s}^2, \sigma^* 2 \mathrm{ s}^2\left[\pi 2 \mathrm{p}_{\mathrm{x}^2=\pi 2 \mathrm{p}_{\mathrm{y}^2\right] \sigma 2 \mathrm{p}_{\mathrm{z}^2 \\ & \text{ B.O. }=\frac{10-4}{2}=6 \\ & \mathrm{He}_2 \\ & \left(4 \mathrm{e}^{-}\right): \sigma 1 \mathrm{ s}^2, \sigma^* 1 \mathrm{ s}^2 \\ & \text{ B.O. }=\frac{2-2}{2}=0\end{aligned}$