Understanding the basics of organic chemistry, including the definition of organic compounds, the role of carbon in organic molecules, and the importance of organic chemistry in various industries.
Introduction to Organic Chemistry – Study Notes
| Concept | Key Points |
|---|---|
| Carbon’s Bonding Ability | • 4 valence electrons → four covalent bonds (tetrahedral geometry). • Forms single, double, triple bonds and rings. |
| Hybridization | • sp³ – tetrahedral (σ‑bonds only). • sp² – trigonal planar (one σ + one π). • sp – linear (one σ + two π). |
| Isomerism | • Structural (constitutional) isomers – different connectivity. • Stereoisomers – same connectivity, different spatial arrangement (geometric & optical). |
| Functional Groups | Identify the reactive “signature” of a molecule (e.g., alcohol –OH, carbonyl C=O, carboxyl COOH). |
| Reaction Types | • Addition – π‑bond breaks, new σ‑bonds form (alkenes, alkynes). • Elimination – removal of atoms to form a π‑bond. • Substitution – one group replaces another (SN1, SN2). • Rearrangement – atoms shift within the molecule. |
| Stability Trends | • Alkane < Alkene < Alkyne (bond strength). • More substituted alkenes are more stable. • Aromatic systems gain extra stability (resonance). |
| Class | General Formula | Representative Functional Group(s) |
|---|---|---|
| Alkanes | CₙH₂ₙ₊₂ | None (saturated C–C σ‑bonds) |
| Alkenes | CₙH₂ₙ | C=C (double bond) |
| Alkynes | CₙH₂ₙ₋₂ | C≡C (triple bond) |
| Aromatics | CₙHₙ (often C₆H₆) | Conjugated ring with delocalized π‑electrons |
| Alcohols | R–OH | Hydroxyl (–OH) |
| Ethers | R–O–R' | Ether linkage (–O–) |
| Aldehydes | R–CHO | Carbonyl attached to at least one H |
| Ketones | R–CO–R' | Carbonyl between two carbon groups |
| Carboxylic Acids | R–COOH | Carboxyl (–COOH) |
| Esters | R–COO–R' | Carbonyl + alkoxy (–COOR) |
| Amines | R₃N | Nitrogen with three substituents |
| Amides | R–CONR₂ | Carbonyl attached to nitrogen |
| Halides | R–X (X = F, Cl, Br, I) | Carbon |