Homologous series: Organic compounds with the same functional group, but different carbon chain length.
Characteristics of a homologous series:
- Same general formula
- Chemically similar;
- Same functional group
- Trend in physical properties eg inc bp as Mr inc.
- Each member of the series differs from the next by CH2.
Structural Isomerism:
Compounds with the same molecular formula, but a different structure.
Branched chain isomers have lower boiling points because...
- They have less surface area
- So less Van der Waals
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