Chapter 20, Problem 7A

(a)

Interpretation Introduction

Interpretation: The structural formula of the straight-chain alkanes of ethane is to be drawn.

Concept Introduction:

Alkanes are the hydrocarbons which contain Carbon carbon single bond and are called saturated hydrocarbons.

Answer to Problem 7A

  $\begin{array}{l}\text{H}\text{H}\\ \left|\right|\\ \text{H}-\text{C}-\text{C}-\text{H}\\ \left|\right|\\ \text{H}\text{H}\end{array}$

Explanation of Solution

The alkane with two carbon atoms can be written as $\begin{array}{l}\text{H}\text{H}\\ \left|\right|\\ \text{H}-\text{C}-\text{C}-\text{H}\\ \left|\right|\\ \text{H}\text{H}\end{array}$ which can be condensed to ${\text{C}}_2{\text{H}}_6$ .

(b)

Interpretation Introduction

Interpretation:The structural formula of the straight-chain alkanes of butane is to be drawn.

Concept Introduction: Alkanes are the hydrocarbons which contain Carbon carbon single bond and are called saturated hydrocarbons.

Answer to Problem 7A

  $\begin{array}{l}\\ \text{H}\text{H}\text{H}\text{H}\\ \left|\right|\left|\right|\\ \text{H}-\text{C}-\text{C}-\text{C}-\text{C}-\text{H}\\ \left|\right|\left|\right|\\ \text{H}\text{H}\text{H}\text{H}\\ \end{array}$

Explanation of Solution

The alkane with four carbon atoms can be written as $\begin{array}{l}\\ \text{H}\text{H}\text{H}\text{H}\\ \left|\right|\left|\right|\\ \text{H}-\text{C}-\text{C}-\text{C}-\text{C}-\text{H}\\ \left|\right|\left|\right|\\ \text{H}\text{H}\text{H}\text{H}\\ \end{array}$ which can be condensed to ${\text{CH}}_3-{\left({\text{CH}}_2\right)}_2-{\text{CH}}_{\text{3}}$ .

(c)

Interpretation Introduction

Interpretation: The structural formula of the straight-chain alkanes of hexane is to be drawn.

Concept Introduction: Alkanes are the hydrocarbons which contain Carbon carbon single bond and are called saturated hydrocarbons.

Answer to Problem 7A

  $\begin{array}{l}\\ \text{H}\text{H}\text{H}\text{H}\text{H}\text{H}\\ \left|\right|\left|\right|\left|\right|\\ \text{H}-\text{C}-\text{C}-\text{C}-\text{C}-\text{C}-\text{C}-\text{H}\\ \left|\right|\left|\right|\left|\right|\\ \text{H}\text{H}\text{H}\text{H}\text{H}\text{H}\\ \end{array}$

Explanation of Solution

The alkane with six carbon atoms can be written as $\begin{array}{l}\\ \text{H}\text{H}\text{H}\text{H}\text{H}\text{H}\\ \left|\right|\left|\right|\left|\right|\\ \text{H}-\text{C}-\text{C}-\text{C}-\text{C}-\text{C}-\text{C}-\text{H}\\ \left|\right|\left|\right|\left|\right|\\ \text{H}\text{H}\text{H}\text{H}\text{H}\text{H}\\ \end{array}$ which can be condensed to ${\text{CH}}_3-{\left({\text{CH}}_2\right)}_4-{\text{CH}}_{\text{3}}$