Peroxide ion
(i) has five completely filled antibonding molecular orbitals
(ii) is diamagnetic
(iii) has bond order one
(iv) is isoelectronic with neon.
Which one of these is correct ?

Options

A. (iv) and (iii)
B. (i),(ii) and (iv)
C. (i), (ii) and (iii)
D. (i) and (iv)

Explanation

Peroxide ion is `O_(2)^(2-)`
Total electrons `=18`
`E.C.=sigma1s^(2)sigma^(**)1s^(2)sigma2s^(2)sigma^(**)2s^(2)sigma(p_(z))^(2)pi(2pi_(x))^(2)pi(2p_(y))^(2)pi^(**)(2p_(x))^(2)pi^(**)(2p_(y))^(2)`
`B.O.=(10-8)/(2)=1`
Options (ii) and (iii) are correct.