Chapter 21, Problem 80A

Interpretation Introduction

Interpretation:

The general formula of cycloalkanes needs to be determined.

Concept introduction:

When the carbon atoms of hydrocarbons are arranged in such a way that it results in the formation of ring then it is said to be cycloalkanes.

Answer to Problem 80A

The general formula of cycloalkanes is

Explanation of Solution

The general formula of alkane is So, for an alkane having 5 carbon atoms is a linear chain, the formula of the alkane will be pentane that means pentane contains 5 carbon atoms and 12 hydrogen atoms as shown:

For a cycloalkane formed from 5 carbon atoms, the structure and the molecular formula will be:

Cyclopentane that means it contains 5 carbon atoms and 10 hydrogen atoms

Since, in cycloalkane the number of hydrogen atoms are less from alkane by 2 units so, the general formula of cycloalkane will be:

Hence, the general formula of cycloalkanes is