Which is not paramagnetic?

Options

A. `O_(2)`
B. `O_(2)^(+)`
C. `O_(2)^(-)`
D. `O_(2)^(2-)`

Answer

D

Explanation

(d) `O_(2)^(2-)` has no unpaired electron,hence it is diamagnetic. `O_(2)^(2-)=sigma1s^(2)overset(**)sigmas^(2)sigma2s^(2)overset(**)sigma2s^(2)" "sigma2p_(x)^(2)pi2p_(y)^(2)pi2p_(z)^(2)overset(**)pip_(y)^(2)overset(**)pi2p_(z)^(2)`