1.

In `O_2^-, O_2 ` and `O_2^(-2)` molecular species, the total number of antibonding electrons respectively areA. 7,6,8B. 1,0,2C. 6,6,6D. 8,6,8

Answer» Correct Answer - A
Molecular orbitals electronic configuration of these species are :
`O_(2)^(-)(17e^(-))=sigma1s^(2)sigma^(**)1s^(2),sigma2s^(2)sigma^(**)2s^(2),sigma2p_(x)^(2),pi2p_(y)^(2),pi2p_(z)^(2),pi^(**)2p_(y)^(2)pi^(**)2p_(z)^(1)`
`O_(2)(16e)=sigma1s^(2)sigma^(**)1s^(2),sigma2s^(2)sigma^(**)2s^(2),sigma 2p_(x)^(2),pi2p_(y)^(2),pi 2p_(z)^(2)pi^(**)2p_(y)^(1)pi^(**)2p_(z)^(1)`
`O_(2)^(2-)(18e) =sigma1s^(2)sigma^(**)1s^(2),sigma2s^(2)sigma^(**)2s^(2),sigma2p_(x)^(2),pi2p_(y)^(2),pi2p_(z)^(2)pi^(**)2p_(y)^(2)pi^(**)2p_(z)^(2)`
Hence, number of antibonding electrons are 7,6 and 8 respectively.


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