Suffixes sulfonic acids

The suffix -sulfonic acid is added to the hydrocarbon name.)... 

Carboxylic acids are an important class of organic acids, but there is another important class known as the sulfonic acids. Sulfonic acids have the general structure shown in 77, and R may be any alkyl groups (methyl, ethyl, butyl, etc.). (Sulfonic acids were introduced in Chapter 6, Section 6.2.4.) Aliphatic sulfonic acids are named by using the name for the hydrocarbon unit R, with the suffix sulfonic acid. Examples include the one-carbon sulfonic acid 78. The one-carbon hydrocarbon is methane, and the one-carbon sulfonic acid 78 is named methane-sulfonic acid. Similarly, 79 is a three-carbon sulfonic acid named propane sulfonic acid. Substituents are handled much like carboxylic acids, in that the SO3H unit... 

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