Chapter 7, Problem 7.78CP

Interpretation Introduction

Interpretation:

To draw as many resonance structures using curved arrows that obey the octet rule for each of the following molecules or ions:

1. HN₃   (b) SO₃   c) SCN^—

Concept introduction:

Resonance structures:

An organic compound does not have any single Lewis structure, the true structure is intermediate in between two three Lewis structures. These intermediate structures are called resonance structures.

Resonance structures are created by the moving of electrons but not moving of atoms.

Rules to draw resonance structure:

Rule 1: The placement of atoms and single bonds are stay at same position. The resonance structures differ in their position of multiple bonds and non bonded electrons.

Rule 2: All resonance structures of particular compound must have same number of unpaired electrons.

Rule 3: Resonance structures must be valid Lewis structures.

a)

To determine:

Resonance structure of HN₃

b)

Interpretation Introduction

To determine:

Resonance structure of SO₃

c)

Interpretation Introduction

To determine:

Resonance structure of SCN^-