Question
Decreasing order of stability of $${O_2},O_2^ - ,O_2^ + $$ and $$O_2^{2 - }$$ is
A.
$$O_2^ + > {O_2} > O_2^ - > O_2^{2 - }$$
B.
$$O_2^{2 - } > O_2^ - > {O_2} > O_2^ + $$
C.
$${O_2} > O_2^ + > O_2^{2 - } > O_2^ - $$
D.
$$O_2^ - > O_2^{2 - } > O_2^ + > {O_2}$$
Answer :
$$O_2^ + > {O_2} > O_2^ - > O_2^{2 - }$$
Solution :
Order of stability $$ \propto $$ bond order
∴ Order of the stability of given species,
$$\eqalign{
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O_2^ + > {O_2} > O_2^ - > O_2^{2 - } \cr
& {\text{Bond}}\,\,{\text{order}}\,\,\,\,\,\,2.5\,\,\,\,\,\,\,\,\,\,\,2\,\,\,\,\,\,\,\,\,\,1.5\,\,\,\,\,\,\,\,\,\,1 \cr} $$