Chapter 2, Problem 2C.6E

(a)

Interpretation Introduction

Interpretation:

Lewis structure of triiodide ion $\left({\text{I}}_3^{-}\right)$ has to be drawn and whether it is radical or not has to be determined.

Concept Introduction:

Lewis structure represents covalent bonds and describes valence electrons configuration of atoms. The covalent bonds are depicted by lines and unshared electron pairs by pairs of dots. The sequence to write Lewis structure of some molecule is given as follows:

• The central atom is identified and various other atoms are arranged around it. This central atom so chosen is often the least electronegative.
• Total valence electrons are estimated for each atom.
• single bond is first placed between each atom pair.
• The electrons left can be allocated as unshared electron pairs or as multiple bonds around symbol of element to satisfy the octet (or duplet) for each atom.
• Add charge on overall structure in case of polyatomic cation or anion.

(b)

Interpretation Introduction

Interpretation:

Lewis structure of methyl cation $\left({\text{CH}}_3^{+}\right)$ has to be drawn and whether it is radical or not has to be determined.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

Lewis structure of methyl anion $\left({\text{CH}}_3^{-}\right)$ has to be drawn and whether it is radical or not has to be determined.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

Lewis structure of chlorine dioxide $\left({\text{ClO}}_2\right)$ has to be drawn and whether it is radical or not has to be determined.

Concept Introduction:

Refer to part (a).