Study GuideOrganic Chemistry II–Aromatic Compounds1.Benzene–Structure, Stability, and ResonanceBenzene is one of the most important molecules in organic chemistry. At first glance, its formulaseems simple. But understanding its structure took many years of scientific discovery.Let’s go step by step and make everything clear.1. Discovery of Benzene’s FormulaIn1834, Eilhardt Mitscherlich determined the molecular formula of benzene to be:Now compare this with a saturated six-carbon alkane:That means benzene is missing8 hydrogenscompared to a saturated compound.What does this tell us?This indicatesfour degrees of unsaturation, which could mean:•Double bonds•A ring•Or a combination of bothSo benzene must contain multiple unsaturations.2. Kekulé’s Proposed Structure (1866)In 1866, August Kekulé proposed a structure for benzene based on three key ideas:•Benzene has formulaC₆H₆•Each carbon formsfour bonds•All hydrogens areequivalentPreview Mode
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