Organic Chemistry Lessons & Study Guide

## The World of Carbon Carbon is a unique element. Its ability to form four strong covalent bonds makes it the foundation of all organic compounds, from simple methane to complex DNA. ### Types of Bonds - **Single Bonds**: In molecules like ethane (\(C_2H_6\)), carbon atoms share one pair of electrons. - **Double and Triple Bonds**: Carbon can also make double (as in ethene, \(C_2H_4\)) or triple bonds (as in ethyne, \(C_2H_2\)), increasing the diversity of organic compounds. ### Shapes and Structures - **Tetrahedral Geometry**: When carbon forms four single bonds, the molecule's shape is tetrahedral, like in methane. - **Planar Geometry**: Double bonds create flat, planar molecules, such as in ethene. - **Linear Geometry**: Triple bonds make molecules linear, like in acetylene. ### Isomerism Organic molecules can have the same formula but different structures (isomers), leading to unique properties. ## Why It Matters Understanding structure and bonding helps chemists design medicines, materials, and fuels.