Organic
Organic Chemistry
Chemistry of carbon — life, materials, drugs, fuels
Organic chemistry is the study of carbon-containing compounds. Carbon's unique versatility (4 bonds, can chain, ring, double/triple bonds) enables enormous diversity — millions of compounds. Foundation: hydrocarbons (alkanes, alkenes, alkynes, aromatics) plus functional groups (alcohols, amines, carbonyls, etc.). Includes biomolecules (proteins, DNA, sugars, lipids). Synthesis follows mechanistic patterns (SN1/SN2, electrophilic addition, etc.). Powers: pharmaceuticals, plastics, agrochemicals, fuels, dyes, food additives. Most-studied branch of chemistry.
- ElementCarbon (4 valence electrons; sp³, sp², sp hybridization)
- HydrocarbonsAlkanes, alkenes, alkynes, aromatics
- Functional groups-OH, -NH₂, -COOH, -C=O, -OR, -X, etc.
- Compounds known~20+ million organic compounds
- NotableBiomolecules (proteins, DNA, sugars), polymers
- FoundationFriedrich Wöhler synthesized urea (1828)
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Why organic chemistry matters
- Biology. All life is organic chemistry.
- Pharmaceuticals. Drug design and synthesis.
- Materials. Plastics, polymers, fibers.
- Energy. Fossil fuels, biofuels.
- Food chemistry. Nutrition, additives.
- Synthesis. Building complex molecules.
- Petroleum industry. Refining, petrochemicals.
Common misconceptions
- Organic = natural. Many synthetics are organic.
- Inorganic doesn't have C. Some do (CO₂, carbonates).
- Organic chemistry is just memorization. Mechanisms are systematic.
- Carbon = life only. Carbon-based throughout chemistry.
- Organic chemicals always toxic. Many essential to life.
- Organic chemistry simple. Most diverse branch.
Frequently asked questions
What makes carbon special?
Several reasons. (1) 4 valence electrons → 4 bonds. (2) Can bond to itself (catenation) — long chains, rings. (3) Multiple bonds (single, double, triple). (4) sp³, sp², sp hybridizations. (5) Electronegativity moderate — bonds to H, O, N, halogens easily. Combination: enormous structural diversity. No other element matches versatility.
What are functional groups?
Specific atomic groups that determine chemical behavior. Examples: -OH (alcohol/phenol), -COOH (carboxylic acid), -NH₂ (amine), -C=O (carbonyl: ketone, aldehyde), -OR (ether), -X (halide), -NO₂ (nitro). Functional groups have characteristic reactivity. Molecule's overall properties: combination of functional groups + hydrocarbon backbone.
How do hydrocarbons differ?
Alkanes: only C-C and C-H single bonds (saturated). General: CnH(2n+2). Alkenes: at least one C=C double bond. CnH(2n). Alkynes: C≡C triple bond. CnH(2n-2). Aromatics: benzene-like ring; alternating C=C / planar / 4n+2 π electrons. Different reactivity, properties.
What's a name reaction?
Common synthetic method named for discoverer. Examples: Diels-Alder (cycloaddition), Wittig (alkene synthesis), Suzuki coupling (C-C bond), Grignard (organomagnesium), Friedel-Crafts (alkylation). Mechanism known; predictable results. Used for retrosynthesis (working backward from target).
How are organic compounds named?
IUPAC rules. (1) Identify longest carbon chain. (2) Number for lowest locants of substituents. (3) Name substituents alphabetically. (4) Add suffix for functional group (e.g., -ol for alcohol). Example: 2-methylpropan-1-ol. Used systematically across chemistry. Common names also exist (e.g., acetone, ethanol).
What are biomolecules?
Organic compounds in living systems. Four major classes. (1) Proteins (amino acids, enzymes). (2) Nucleic acids (DNA, RNA, nucleotides). (3) Carbohydrates (sugars, starch). (4) Lipids (fats, phospholipids, steroids). Combined with water, ions, small molecules: full biology. Organic chemistry foundation of biochemistry.
How does organic chemistry impact daily life?
Pervasively. (1) Pharmaceuticals — most drugs are organic. (2) Plastics — polyethylene, PVC, PET. (3) Fuels — gasoline, diesel, ethanol. (4) Food — proteins, fats, sugars, vitamins. (5) Cosmetics, detergents, dyes. (6) Pesticides, herbicides. (7) Materials — fibers, rubber, paper. Modern life impossible without organic chemistry.