1.

According to `MOT` whch of the following statement about magnetic character and bond order is corrent regarding `O_(2)^(o+)` .A. Paramagnetic and bond order `lt O_(2)`B. Paramagnetic and Bond order `gt O_(2)`C. Diamagnetic and Bond order `lt O_(2)`D. Diamagnetic and Bond order `gt O_(2)`

Answer» Correct Answer - B
`O_(2): sigma1s^(2),sigma^(**)1s^(2),sigma2s^(2),sigma^(**)2s^(2),sigma2p_(x)^(2),{{:(pi 2p_(y)^(2)),(pi 2p_(z)^(2)):}{{:(pi^(**)2p_(y)^(1)),(pi^(**)2p_(z)^(1)):}`
Bond order =`(10-6)/2` ltBrgt (Two unpaired electrons in antibonding molecular orbital)
`O_(2)^(+): sigma1s^(2),sigma^(**)1s^(2),sigma2s^(2),sigma^(**)2s^(2),sigma2p_(x)^(2),{{:(pi 2p_(y)^(2)),(pi 2p_(z)^(2)):}{{:(pi^(**)2p_(y)^(1)),(pi^(**)2p_(z)^(0)):}`
Bond order `=(10-5)/2=2.5`
(one unpaired electron in antibonding molecular orbital) hence `O_(2)` as well as `O_(2)^(+)` is paramagnetic , and bond order of `O_(2)^(+)` is greater than that of `O_(2)`.


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