Question

Consider the ions/molecule:

\[\ce{O^+_2, O_2, O^-_2, O^{2-}_2}\]

For increasing bond order the correct option is:

Options

• \[\ce{O^{2-}_2 < O^-_2 < O2 < O^+_2}\]

• \[\ce{O^-_2 < O^{2-}_2 < O2 < O^+_2}\]

• \[\ce{O^-_2 < O^{2-}_2 < O^+_2 < O2}\]

• \[\ce{O^-_2 < O^+_2 < O^{2-}_2 < O2}\]

Answer 1

\[\ce{O^{2-}_2 < O^-_2 < O2 < O^+_2}\]

Explanation:

ions/molecule	Number of e− in BMO	Number of e− in ABMO	Bond order
\[\ce{O^+_2}\]	10	5	2.5
\[\ce{O2}\]	10	6	2
\[\ce{O^-_2}\]	10	7	1.5
\[\ce{O^{2-}_2}\]	10	8	1

Bond order: \[\ce{O^{2-}_2 < O^-_2 < O2 < O^+_2}\]