Question

which of the molecules and polyatomic ions cannot be adequately described using a single lewis structure?
of₂
ch₂cl₂
o₃
hcn
nh₄+
co₃²-

Explanation:

• \(OF_{2}\): Has a single Lewis structure with \(O\) as the central atom, single - bonded to two \(F\) atoms and having two lone pairs on \(O\).
• \(CH_{2}Cl_{2}\): Carbon is the central atom, single - bonded to two \(H\) and two \(Cl\) atoms. A single Lewis structure can represent it.
• \(O_{3}\): It has resonance structures. The double bond can be between different pairs of \(O\) atoms. So, a single Lewis structure is not sufficient.
• \(HCN\): Carbon is the central atom, triple - bonded to \(N\) and single - bonded to \(H\). A single Lewis structure can represent it.
• \(NH_{4}^{+}\): Nitrogen is the central atom, single - bonded to four \(H\) atoms (with a positive charge on the ion). A single Lewis structure can represent it.
• \(CO_{3}^{2 -}\): It has resonance structures. The double bond can be between \(C\) and different \(O\) atoms. So, a single Lewis structure is not sufficient.

Answer:

\(O_{3}\), \(CO_{3}^{2 -}\)