Chapter 2, Problem 2C.1E

(a)

Interpretation Introduction

Interpretation:

Whether ${\text{NO}}_2^{-}$ act as radical or not has to be determined.

Concept Introduction:

Radicals are the species with unpaired valence electron and are highly chemically reactive. They have electrons with unpaired spins. For example, ${\text{HOO}}^{\cdot }$ is a radical with total 13 valence electrons. The Lewis structure of ${\text{HOO}}^{\cdot }$ is as below:

(b)

Interpretation Introduction

Interpretation:

Whether ${\text{CH}}_3$ acts as radical or not has to be determined.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

Whether $\text{OH}$ act as radical or not has to be determined.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

Whether ${\text{CH}}_2\text{O}$ act as radical or not has to be determined.

Concept Introduction:

Refer to part (a).

${\text{CH}}_2\text{O}$ is not a radical.