REVISION ORGANIC CHEMISTRY

HYDROCARBON A bond or an atom or a group of atoms that determine(s) the physical and chemical properties of a group of organic compounds HOMOLOGOUS SERIES FUNCTIONAL GROUP A series of organic compounds that can be described by the same general formula Organic compounds that consist of hydrogen and carbon only

alkanes alkenes alkynes haloalkanes alcohols aldehydesketones esters Carboxylic acids

Single bonds Double bonds Tripple bonds halides hydroxyl Carbonyl with hydrogen Carbonyl Carbonyl with oxygen Carbonyl with hydroxyl

IUPAC NAMES

2-methylbut-1-ene 2-methylprop-1-ol 1-bromo-2-chlorocyclopentane 4,4-dimethylpent-2-yne 3-methylbutanal

IUPAC NAMES pent-2-one Propanoic acid Methyl butanoate

When naming halo alkanes, the halogen atoms do not get preference over alkyl groups – numbering should start from the end nearest to the first substituent, either the alkyl group or the halogen. In halo alkanes, where e.g. a Br and a Cℓ have the same number when numbered from different ends of chain, Br gets alphabetical preference When writing IUPAC names, substituents appear as prefixes written alphabetically (bromo, chloro, ethyl, methyl), ignoring the prefixes di- and tri. IUPAC NAMES

SATURATED COMPOUNDS UNSATURATED COMPOUNDS Compounds in which there are no multiple bonds between C atoms in their hydrocarbon chains.. Compounds with one or more multiple bonds between C atoms in their hydrocarbon chains.

MOLECULAR FORMULA A chemical formula that indicates the type of atoms and the correct number of each in a molecule A structural formula of a compound shows which atoms are attached to which within the molecule. Atoms are represented by their chemical symbols and lines are used to represent ALL the bonds that hold the atoms together. STRUCTURAL FORMULA This notation shows the way in which atoms are bonded together in the molecule, but DOES NOT SHOW ALL bond lines. CONDENSED STRUCTURAL FORMULA:

ISOMERS STRUCTURAL Organic molecules with the same molecular formula, but different structural formulae. CHAIN Same molecular formula, but different types of chains POSITIONAL Same molecular formula, but different positions of the side chain, substituents or functional groups on the parent chain,

ISOMERS Hexane 2-methylpentane 2,2-dimethylbutane

propene Compound X QUESTIONS ABOUT REACTIONS when you have the REACTANTS…

propene Compound X QUESTIONS ABOUT REACTIONS when you have the REACTANTS…

QUESTIONS ABOUT REACTIONS when you have the REACTANTS & PRODUCTS

PHYSICAL ATTRIBUTES

BOILING POINTS VAPOUR PRESSURE Stronger forces = highest boiling points, because more energy is neede to break the bonds Increases with size Because van der Waals forces increases with size, therefore longer chains have stronger forces and need more energy to break the bonds Decreases with brancing, because branched chains cannot fit tightly together, therefore they are further apart and the van dier Waals forces weaker. Less energy is neede tot break the bonds (how easily it evapourates) Decrease with size, because van der Waals force increase with size Long chaings have stonger forces, therefore more energy is needed to break the bonds and so longer chains take longer to evapourate

MELTING POINTS Stronger forces = highest boiling points, because more energy is neede to break the bonds Increases with size Because van der Waals forces increases with size, therefore longer chains have stronger forces and need more energy to break the bonds Increases with simmetry (of spherical shapes), because symmetrical molecules have a small surface area, meaning they can be packed close together and intermolecular forces are stronger…more energy is needed to to break the molecules from the solid network structure

SOLUBILITY “Like dissolves like” THEREFORE If the intermolecular forces between the solvent and solute are the same, it will dissolve It the forces are different, it will not dissolve

VISCOSITY Resistance to flow (how sticky it is) Increases with size, because van der Waals forces increase with size Long chains have stronger forces and will therefore have a high viscosity Die teenstand teen vloei ( of hoe taai dit is)

QUESTIONS ABOUT BOILING POINTS, SOLUBILITY, VISCOSITY etc.