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The main difference between hydrocarbons and other organic molecules is their composition and chemical properties.

Hydrocarbons are organic molecules composed exclusively of carbon and hydrogen atoms. They form the simplest class of organic compounds. Due to only carbon and hydrogen, hydrocarbons are highly hydrophobic (repel water) and nonpolar. They are primarily derived from fossil fuels such as petroleum and natural gas. They can be classified into different types based on their structure, including alkanes, alkenes, alkynes, and aromatic hydrocarbons.

On the other hand, other organic molecules can contain elements besides carbon and hydrogen, such as oxygen, nitrogen, sulfur, and phosphorus. These molecules are typically more complex and diverse in their structures and properties than hydrocarbons.

The presence of additional elements in organic molecules leads to the formation of different functional groups, which greatly influence their chemical reactivity and behavior. Functional groups are specific arrangements of atoms within a molecule that confer distinct chemical properties and determine the molecule's functionality.

Some common functional groups in organic molecules include hydroxyl, carbonyl, carboxyl, amino, and phosphate. These functional groups contribute to various organic compounds' characteristic properties and functions, such as alcohols, aldehydes, ketones, carboxylic acids, amines, and nucleic acids.