Which of the following has least bond energy ? `

Options

A. `N_2^(2-)`
B. `N_2^(-)`
C. `N_2^(+)`
D. `N_2`

Answer

A

Explanation

`N_(2)^(2-)=KK' sigma2S^(2),overset(**)sigma 2s^(2),pi2p_(x)^(2)~~pi2p_(y)^(2),sigma2p_(z)^(2)`
`overset(**)(pi)2overset(1)(p)x~~overset(**)2p_(y)^(1)`
Bond order `=(N_(b)-N_(a))/(2)=(8-4)/(2)=2`
`:'` Bond energy `prop` Bond order
`:.N_(2)^(2-)` has least bond energy .