MCQ
The bond length the species ${O_2},O_2^ + $ and $O_2^ - $ are in the order of
  • $O_2^ - > {O_2} > O_2^ + $
  • B
    $O_2^ + > O_2^ - > {O_2}$
  • C
    ${O_2} > O_2^ + > O_2^ - $
  • D
     $O_2^ + > {O_2} > O_2^ - $

Answer

Correct option: A.
$O_2^ - > {O_2} > O_2^ + $
(a) As bond order increase bond length decrease the bond order of species are

$ = \frac{{{\rm{number \,of\, bonding \,electron - Number \,of \,}}a{\rm{.}}b{\rm{. electron}}}}{2}$

For ${O_2} = \frac{{10 - 6}}{2} = 2$ ;

$O_2^ + = \frac{{10 - 5}}{2} = 2.5$

$O_2^ - = \frac{{10 - 7}}{2} = 1.5$

So, bond order $O_2^ + > {O_2} > O_2^ - $

 

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