Chapter 22, Problem 1TC

Rank the following hydrocarbons in order of increasing number of hydrogens:

To determine

The ranking of the given hydrocarbons in order of increasing number of hydrogens:

Answer to Problem 1TC

The correct order of increasing number of hydrogens in the given hydrocarbons is $\text{A}<\text{B}<\text{C}$

Explanation of Solution

To count the overall number of H-atoms exiting in the structure, first of all, the structures need to be written in the kekule structure in which carbon atom is present at the joining of the two lines and each carbon can form four bonds with each-other or with hydrogen, i.e. it should not have more than four bonds in a structure.

As shown in the Fig.(1),the overall number of hydrogen in the structure A is 8, the overall number of hydrogen in the structure B is 10, and the overall number of H atomin the structure C is 12.

Thus, the correct order of increasing number of hydrogensis $\text{A}<\text{B}<\text{C}$

Conclusion:

Therefore, the correct order of increasing number of hydrogens in the given hydrocarbons is $\text{A}<\text{B}<\text{C}$