Assuming that Hund's rule is violated the bond order and magnetic nature of the diatomic molecle `B_(2)` is

Options

A. 1 and diamagnetic
B. 0 and diamagnetic
C. 1 and paramagnetic
D. 0 and paramagnetic

Answer

A

Explanation

If Hund's rule is violated, molecular electronic configuration of `B_2` will
`sigma_(1s)^2 sigma_(1s)^(**2) sigma_(2s)^2 sigma_(2s)^(2+) pi_(2px)^2 pi_(2py)^0`
Bond order `1/2`[6-4]= 1
It will be diamagnetic due to the presence of unpaired electrons.