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Which of the following is paramagnetic with bond order0.5?
A.F2B.H2+C.N2D. O2

Answer
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Hint: For solving this question, one should have a better understanding of how to draw the molecular orbital diagram as when you draw the diagram it becomes easy to solve this question. After drawing the diagram use the formula B.O=NB - NA2 to find out the bond order of each of the molecule.

Complete answer:
For solving this question we need to use the molecular orbital theory (MOT). This theory uses a method for describing the electronic structure of molecules using quantum mechanics. For drawing the molecular orbital diagram we need to know the electronic configuration of each of the following. for finding the bond order we use the formula :
B.O=NB(no. of electrons in bonding orbital) - NA(no. of electrons in antibonding orbitals)2
Electronic configuration of F2=1s22s22p5
Its molecular orbital diagram will be:
seo images

As it can be seen in F2 that there are no single electrons present in the any of the orbitals so it is diamagnetic and its bond order is:
B.O=NB - NA2
8 - 62
22=1
Electronic configuration of H2+=1s1
Its molecular orbital diagram is:
seo images

12=0.5
Thus there is one unpaired electron and so H2+ is paramagnetic. Its bond order is:
B.O=NB - NA2
1 - 02

Electronic configuration of N2=1s22s22p3
Molecular orbital diagram
seo images

There are no unpaired electrons in N2 and its bond order is:
B.O=NB - NA2
8 - 22
62=3
Electronic configuration of O2=1s22s22p5
Molecular orbital diagram
seo images

There are no unpaired electrons in O2 and its bond order is:
B.O=NB - NA2
8 - 52
32=1.5
Thus, from the above data we can clearly see that only H2+ is paramagnetic with the bond order of0.5.

Therefore the correct option is B. H2+ .

Note:
While drawing the molecular orbital diagram for the elements above helium, the 1s2 orbital can be neglected because it always has 2 electrons in it, and this orbital is always completely filled. A diatomic molecular orbital diagram is used to understand the bonding of a diatomic molecule. MO diagrams can be used to deduce the magnetic properties of a molecule and how they change with ionization.
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