1.

Assuming that Hund's rule is viovated , the bond order and magnetic nature of diatomic molecule B_(2) is

Answer»

1 and diagagnetic
0 and diamagnetic
1 and paramagnetic
0 and paramagnetic

Solution :If Hund's rule is violated, molecular orbital
electronic configuration of `B_(2)` will be
`sigma_(1S)^(2)sigma_(1s)^(**2)sigma_(2s)^(2)sigma_(2s)^(**2)sigma_(2p_(Z))^(2)pi_(2p_(x))^(2)pi_(2p_(y))^(2)pi_(2p_(x))^(**2)pi_(2p_(y))^(**2)`
It will be diamgnetic with bond order
`(1)/(2) (6-4) = 1`


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