Question

Which of the molecules and polyatomic ions cannot be adequately described using a single lewis structure? hcn ch2cl2 o3 of2 co2–3 nh+4?

Answer 1

Only two on the choice is the answer, and it is O(3) and CO(3)^2-The polyatomic ions and molecules that cannot be adequately described using a single lewis structure is 0(3) and CO(3)^2-
So, The answer in this question is C0(3)^2- and 0(3)

Answer 2

$\boxed{{{\mathbf{O}}_{\mathbf{3}}}\;{\mathbf{and}}\;{\mathbf{CO}}_{\mathbf{3}}^{{\mathbf{2 - }}}}$ cannot be adequately described using a single Lewis structure.

Further Explanation:

The bonding between the different atoms in covalent molecules is shown by some diagrams known as the Lewis structures. These also show the presence of lone pairs in the molecule. These are also known as Lewis dot diagrams, electron dot diagrams, Lewis dot structures or Lewis dot formula. In covalent compounds, the geometry, polarity, and reactivity are predicted by these structures.

When more than one Lewis structures are possible for a single molecule but no single structure is able to explain all the properties of the molecule then resonance is used. All the structures thus formed are called resonating structures and the phenomenon is known as resonance. The resonance structures have the same placement of atoms but different locations of bond pairs and lone pairs of electrons. Moreover, various resonating structures can be converted to each other by moving lone pairs to bonding positions, and vice-versa.

Conditions to determine more contributing resonating structures are as follows:

1. Smaller formal charges are always preferred over the larger one.  

2. The point charges must be fewer for more contributing resonating structure.  

3. A more negative formal charge must always be located on the most electronegative atom.

There is no resonance in ${\text{HCN}}$, ${\text{C}}{{\text{H}}_2}{\text{C}}{{\text{l}}_2}$, ${\text{O}}{{\text{F}}_2}$, ${\text{NH}}_4^ +$. so these molecules can be easily explained by a single Lewis structure.

Carbonate $\left( {{\text{CO}}_3^{2 - }} \right)$ is represented by three resonating structure so it cannot be adequately described by a single Lewis structure.

${{\text{O}}_3}$ is represented by two resonating structures so it cannot be adequately described by a single Lewis structure.

Learn more:

1. The moles of ${\text{NaOH}}$ : brainly.com/question/4283309  

2. Weight and mass: brainly.com/question/5956881

Answer details:

Grade: Senior School  

Subject: Chemistry  

Chapter: Chemical bonding and molecular structure

Keywords: O3, OF2, HCN, NH4+, CH2Cl2, CO32-, resonance, resonating structures,  molecules, polyatomic ions, Lewis structures,  Lewis dot diagrams, electron dot diagrams, Lewis dot structures, Lewis dot formula, geometry, polarity, reactivity, covalent compounds, bond pairs, lone pairs.