Which of the following statements is not correct from the viewpoint of molecular orbital?
Which of the following statements is not correct from the viewpoint of molecular orbital?
$\mathrm{Be}_{2}$ is not a stable molecule
$\mathrm{He}_{2}$ is not stable but $\mathrm{He}_{2}^{+}$is expected to exist
Bond strength of $\mathrm{N}_{2}$ is maximum amongst the homonuclear diatomic molecules belonging to the second period
The order of energies of molecular orbitals in $\mathrm{F}_{2}$ molecule is $E(\sigma 2 \mathrm{~s}) < E\left(\sigma^{*} 2 \mathrm{~s}ight) < E\left(\pi 2 \mathrm{p}_{x}ight)=E\left(\pi 2 \mathrm{p}_{y}ight) < E(\sigma 2 \mathrm{p}) < E\left(\pi^{*} 2 \mathrm{p}_{x}ight)=E\left(\pi^{*} 2 \mathrm{p}_{y}ight) < E\left(\sigma^{*} 2 \mathrm{p}ight)$
Solution
1. $\mathrm{Be}_{2}$ has bond order zero, so it is not stable molecule,
2. $\mathrm{He}_{2}$ has bond order zero and $\mathrm{He}_{2}^{+}$has bond order 0.5
3.Bond strength of $\mathrm{N}_{2}$ is maximum as the bond order is 3 that is maximum amongest the homonuclear diatomic molecules belonging to the the second period.4.The order of energies of molecular orbitals in $\mathrm{F}_{2}$ molecule is $\sigma 2 \mathrm{~s} < \sigma * 2 \mathrm{~s} < \sigma 2 \mathrm{p}_{\mathrm{z}} < \left(\pi 2 \mathrm{p}_{\mathrm{x}}= \pi 2 \mathrm{py}_{\mathrm{y}}ight) < \left(\pi * 2 \mathrm{p}_{\mathrm{x}}=\pi * 2 \mathrm{p}_{\mathrm{y}}ight) < \sigma * 2 \mathrm{p}_{\mathrm{z}}$
,