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The shapes of carbon compounds and the ways to draw them. Classification, functional groups and homologous series, the IUPAC rules for naming, and the kinds of structural and spatial isomerism.
Beyond the textbook: counting the structural isomers of a formula and the stereoisomers of a molecule, and comparing the stability of intermediates and the acidity of compounds. The problems that JEE, NEET and A-Level Chemistry ask most, with a full timed paper.