An overview of the fundamental concepts and principles of organic chemistry, including the structure of organic compounds, functional groups, isomerism, and the importance of carbon in organic molecules.
Introduction to Organic Chemistry – Study Notes
| Concept | Key Points | Typical Examples |
|---|---|---|
| Carbon’s Bonding | • 4 valence electrons → 4 covalent bonds (tetrahedral geometry). • Ability to form single, double, triple bonds and catenation (C‑C chains). |
Methane (CH₄), ethene (C₂H₄), acetylene (C₂H₂) |
| Hybridization | • sp³ → tetrahedral (σ‑bonds). • sp² → trigonal planar (σ + π). • sp → linear (σ + 2π). |
CH₄ (sp³), ethene (sp²), acetylene (sp) |
| Functional Groups | Specific atom/group patterns that dictate reactivity. | Alcohol – ‑OH, Carbonyl – C=O, Carboxyl – COOH, Amino – NH₂, Halide – X |
| Isomerism | • Structural (constitutional) isomers: different connectivity. • Stereoisomers: same connectivity, different spatial arrangement (cis/trans, enantiomers). |
Butanol (4 structural isomers), 2‑butene (cis/trans), lactic acid (R/S) |
| Nomenclature (IUPAC) | • Identify longest carbon chain → base name. • Number chain to give substituents lowest possible locants. • Prefixes for substituents, suffixes for functional groups. |
3‑methyl‑2‑pentanol, 1‑chloro‑3‑butene |
| Reaction Types | • Addition – to multiple bonds (e.g., hydrogenation). • Elimination – removal of small molecules (e.g., dehydration). • Substitution – replacement of a group (e.g., SN1/SN2). • Oxidation‑Reduction – change in oxidation state (e.g., oxidation of alcohols). |
Alkene + H₂ → Alkane; 2‑bromo‑propane → propene + HBr |
| Mechanisms | Stepwise electron‑flow descriptions using curved‑arrow notation. | Nucleophilic attack, carbocation rearrangement, radical chain propagation |
| Class | General Formula | Characteristic Functional Group(s) | Typical Uses |
|---|---|---|---|
| Alkanes | CₙH₂ₙ₊₂ | Only C–C and C–H σ‑bonds | Fuels, lubricants |
| Alkenes | CₙH₂ₙ | C=C double bond | Polymer precursors (e.g., ethylene) |
| Alkynes | CₙH₂ₙ₋₂ | C≡C triple bond | Specialty chemicals, pharmaceuticals |
| Aromatics | CₙHₙ (ring |