Question

B2 molecule will be diamagnetic when:-(1) S - P mixing is not operative(II) S - P mixing is operative & Hunds rule is violated(III) S - P mixing is operative & Hunds rule is not violated​

Answer 1

Answer:

In Hund's rule of maximum multiplicity, if two or more orbitals of equal energy are available, electrons will occupy them singly before filling them in pairs.

B

2

(10)=σ

1s

2

σ

1s

2

∗

σ

2s

2

σ

2s

2

∗

π

2p

x

2

Number of bonding electrons = 6

Number of Antibonding electrons = 4

Bond order =

2

(Number of bonding electrons−Number of antibonding electrons)

Bond order =

2

6−4

=1

Since there are no unpaired electrons, it is diamagnetic in nature.

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