Question

Draw the Lewis structure for NO₂^- including any valid resonance structures. Which of the following statements is TRUE?

Draw the Lewis structure for NO₂^- including any valid resonance structures. Which of the following statements is TRUE?

	The nitrite ion contains two N=O double bonds.
	The nitrite ion contains one N

Answer 1

Concepts and reason

Lewis structure gives a detailed explanation of connectivity of atoms that are present in the molecules. It also indicates the lone pair electron of atoms in the molecules.

Formal charge: The charge that is given to an atom in a molecule by assuming that the shared electrons between the two bonded atoms are equally shared between them.

Resonance: Delocalization of the electron density across more than two atoms is termed as resonance. In organic molecules, resonance mostly involves and non-bonded electrons.

Fundamentals

The formal charge on an atom could be calculated as follows:

- Number of valence electrons

- Number of non-bonding electrons

- Number of bonding electrons

Delocalization of electrons within the structure can be explained with the help of resonance. The movement of electrons can be indicated using curved arrows.

The resonance structures explain about delocalization of electrons, and it further provides Lewis structures for the same molecule.

The resonance structures between two resonance contributors are separated by a double-headed arrow called the resonance arrow.

= resonance arrow.

The movement of electrons within the structure is indicated with the help of curved arrows.

= curved arrow.

Example for resonance structure is as follows:

The formal charge is calculated using the formula:

Lewis structure of nitrite ion is as follows:

Formal charge on nitrogen can be calculated as follows:

Formal charge on oxygen can be calculated as follows:

Formal charge on oxygen can be calculated as follows:

Thus, Lewis structure ofwith formal charges on the atoms is given below:

The resonating structure can be expressed as follows:

The false statement is as follows:

The nitrite ion contains two$O=N $double bonds.

The true statement is as follows:

The nitrite ion contains one.

Ans:

Lewis structure of including any valid resonance structure is as follows:

The true statement is as follows:

The nitrite ion contains two$N=0 $double bonds.

The nitrite ion contains one.