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

Peroxide ion …… (i) has five completely filled antibonding molecu

1.	Peroxide ion …… (i) has five completely filled antibonding molecular orbitals (ii) is diamagnetic "" (iii) has bond order one (iv) is isoelectronic with neon Which of these are correct ?
Answer» (III) and (iv) (i) , (ii) and (v) (ii) and (iii) (i) and (v) Solution :PEROXIDE ion is `O_(2)^(2-)` E.C. `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 tha four completely filled antibonding molecular obitals . It is diamgnetic . Bond order `= (1)/(2) (10 - 8) = 1` Total electrons PRESENT = 18 Thus , it is not isoelectronic with neon `._ ""(10)Ne` Hence, only option (ii) and (iii) are correct