Assertion  Fluorine molecule has bond order oneReason  The number of electrons in the antibonding molecular orbitals is two less than that in bonding molecular orbitals

# Assertion  Fluorine molecule has bond order oneReason  The number of electrons in the antibonding molecular orbitals is two less than that in bonding molecular orbitals

1. A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

2. B

If both assertion and reason are true but reason is not the correct explanation of the assertion

3. C

If assertion is true but reason is false.

4. D

If the assertion and reason both are false

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### Solution:

MO electronic configuration of ${F}_{2}$
molecule is

$\begin{array}{r}{F}_{2}=\sigma 1{s}^{2},{\sigma }^{\ast }1{s}^{2},\sigma 2{s}^{2},{\sigma }^{\ast }2{s}^{2},\sigma 2{p}_{x}^{2},\\ \pi 2{p}_{y}^{2}\approx \pi 2{p}_{z}^{2},{\pi }^{\ast }2{p}_{y}^{2}\approx 2{p}_{z}^{2}\end{array}$

Bond order  $=\frac{{N}_{b}-{N}_{a}}{2}$

Where,  ${N}_{b}=$ Number of electrons in bonding molecular orbitals

${N}_{a}=$ Number of electrons in antibonding molecular  orbitals $=\frac{8-6}{2}=1$

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