Paramagnetic behaviour of `B_(2)` is due to the presence of -

Options

A. 2 unpaired electrons in `pi_(b)MO`
B. 2 unpaired electrons in `pi^(**)MO`
C. 2 unpaired electrons in `sigma^(**)MO`
D. 2 unpaired electrons in `sigma_(b)MO`

Answer

A

Explanation

The electronic configuration of `B_(2)` (10 electrons) is `K K(sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(pi_(2px))^(1)(pi_(2py))^(1)`
Since the molecule contains two unpaired electrons in `pi_(b)MO`. It is paramagnetic in nature.