Chapter 2, Problem 2.23E

(a)

Interpretation Introduction

Interpretation:

Whether the $\text{S}-\text{S}$ bond length in the isomers of ${\text{S}}_2{\text{F}}_2$ single bonds or have some double bond character has to be determined.

Concept Introduction:

When a single Lewis structure cannot describe all the experimentally observed properties of a molecule more than one Lewis structure that differs only in the position of multiple bonds is drawn. These are termed resonance structures. The actual molecule is represented by the hybrid of each of these resonance structures.

(b)

Interpretation Introduction

Interpretation:

The two possible resonance structures for each isomer of ${\text{S}}_2{\text{F}}_2$ have to be drawn.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The isomers that are favored by formal-charge considerations in ${\text{S}}_2{\text{F}}_2$ have to be determined.

Concept Introduction:

The formal charge on each atom in the Lewis structure can be calculated from the equation written as follows:

  $\text{Formal charge}=\left[V-L-\frac{1}{2}B\right]$

Here,

$V$ denotes valence electrons in free atom.

$L$ denotes electrons present as lone pairs.

$B$ denotes electrons present as bond pairs.