Chapter 20, Problem 61A

Interpretation Introduction

Interpretation: The structural isomers of the alkane ${\text{C}}_5{\text{H}}_{\text{12}}$ should be drawn.

Concept Introduction: The molecules having same molecular formula but structural arrangement of atoms in the molecule is different are said to be isomers of each other.

Answer to Problem 61A

Isomer I:

  

Isomer II:

  

Isomer III:

  

Explanation of Solution

1. All five-carbon atoms are written in a straight chain.

Isomer I:

  

2. Making a four-carbon atoms straight chain and bonding the fifth carbon-atom to the C atom of straight chain:

For isomer II the fifth carbon atom is bonded to second carbon of the chain.

Isomer II:

  

3. Making a three-carbon atoms straight chain and bonding the fourth and fifth carbon-atom to the C atom of straight chain:

For isomer III the fourth and fifth carbon atoms are attached to second carbon atom of the chain.

Isomer III: