Which statements are correct for the peroxide ion ?
(1) It has five completely filled anti - bonding molecular orbitals
(2) It is diamagnetic
(3) It has bond order one
(4) It is isoelectronic with neon

Options

A. It has five completely filled anti - bonding molecular orbitals.
B. It is diamagnetic.
C. IT has bond order one.
D. It is isoelectronic with neon.

Answer

B, C

Explanation

`O_(2)^(2-):(sigma1s)^(2)(sigma^(**)1s)^(2)(sigma2s)^(2)(sigma^(**)2s)^(2)(sigma2p_(z))^(2)(pi2p_(x))^(2)(pi2p_(y))^(2)(pi^(**)2p_(x))^(2)(pi^(**)2p_(y))^(2)`
It is diamagnetic
`"Bond order"=(10-8)/(2)=1`