Which of the following have been arranged in increasing bond order as well as bond dissociation energy ? .

Options

A. `O_(2)^(+)O_(20^(2-)lt O(2)^(-)`
B. `O_(2)^(2-)lt O_(2)^(-)lt O_(2)lt O_(2)^(+)`
C. `O_(2)lt O_(2)^(+)lt O_(2)^(2-)`
D. `O_(2)^(2-)ltO_(2)^(-)lt O_(2)^(+)lt O_(2)`

Answer

B

Explanation

The MO configuratin of `O_(2)` can be written as
`O_(2)(8+8=16)=overset(**)sigma1s^(2), sigma 2s^(2),`
`overset(**)sigma2s^(2), sigma2p_(z)^(2),pi2p_(x)^(2)~~pi2p_(y)^(2), overset(**)pi2pi_(x)^(1)`
`~~overset(**)pi2p_(y)^(1)`
`therefore` Bond order `=(N_(b)-N_(a))/(2)`
`=(10-6)/(2)=2`
Similarly, `O_(2)^(+)(8+8-1=15),`
`impliesO_(2)^(2-)(8+8+2=18).`
`BO=(10-8)/(2)=1`