Question

Which of the following shows correct order of bond length?

• A. $O _{2}^{+}> O _{2}> O _{2}^{-}> O _{2}{ }^{2-}$
• B. $O _{2}{ }^{+}< O _{2}{ }^{-}> O _{2}< O _{2}{ }^{2-}$
• C. $O _{2}^{+}> O _{2}< O _{2}^{-}> O _{2}^{2-}$
• D. $O _{2}{ }^{+}> O _{2}> O _{2}{ }^{-}> O _{2}{ }^{2-}$

Answer 1

Answer: (B)

Bond length decreases with an increase in bond order. Therefore, the order of bond length in these species is
$O _{2}^{+}< O _{2}^{-}> O _{2} < O _{2}^{2-} O _{2}^{+}
$(bond order $-=2 \cdot 5, O _{2}=2, O _{2}^{-}=1 \cdot 5, O _{2}{ }^{2-}=1 $ )