Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Question Explanation: Compare the bond length of $\mathrm{C}-\mathrm{O}$ in CO vs ${\mathrm{CO}}_2$ and $\mathrm{N}-\mathrm{O}$ in ${\mathrm{NO}}^{-}{}_2$ vs ${\mathrm{NO}}_3{}^{-}$.

Concept:

This question is based on Bond length and bond order relationship.

Solution:

(B) ${}^{\ominus }\mathrm{C}\equiv {\mathrm{O}}^{\oplus }$ $\mathrm{O}=\mathrm{C}=\mathrm{O}$

B.O. 3 $>$ 2

B.L.$(\mathrm{C}-\mathrm{O})$ CO $<$ ${\mathrm{CO}}_2$

(C)

B.O. $\begin{array}{llll}& \frac{3}{2}& >& \frac{4}{3}\\ & & & \end{array}$

$B.L.(\mathrm{N}-\mathrm{O})$ ${\mathrm{NO}}_2^{\ominus }<{\mathrm{NO}}_3^{\ominus }$

Final Answer: The correct option is (B) and (C).