Which of these represents the correct order of their increasing bond order.

Options

A. `C_(2)ltC_(2)^(2-)ltO_(2)^(2-)ltO_(2)`
B. `C_(2)^(2-)ltC_(2)^(+)ltO_(2)ltO_(2)^(2-)`
C. `O_(2)^(2-)ltO_(2)ltC_(2)^(2-)ltC_(2)^(+)`
D. `O_(2)^(2-)lt C_(2)^(+)ltO_(2)lt C_(2)^(2-)`

Answer

D

Explanation

bond order `= (1)/(2)(n_(b)- n_(a))` bond order of `O_(2)^(2-)=(1)/(2)(8 - 6)=1`
bond order of `C_(2)^(+)=(1)/(2)(5 - 2)=1.5` bond order of `O_(2)=(1)/(2)(8 - 4) = 2`
bond order of `C_(2)^(2-)= (1)/(2)(8-2)= 3`