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

Options

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

Answer

A

Explanation

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`