Functional Group

Functional group is a group of atoms tied together which will take part in a chemical reaction therefore determine the chemical properties of the series.
  1. Members of the same homologous series have the same chemical properties because of the presence of a common functional group in all the molecules of the series.
  2. Functional group is a group of atoms tied together which will take part in a chemical reaction therefore determine the chemical properties of the series.
  3. Therefore, the homologous series is a family of organic compound that is made out of members with common functional group, common chemical properties, and consecutive members are differ by one carbon atom and two hydrogen atom, namely, –CH2-.
  4. Table below shows some homologous series and their respective general formula and functional group.

Carbon Compounds General Formula Functional group
Alkane CnH2n+2 Carbon-carbon single bond
- C – C -
Alkene CnH2n Carbon-carbon double bond
- C = C -
Alcohol CnH2n+1OH Hydroxyl group
- OH
Carboxylic Acids CnH2n+1COOH Carboxyl group
- COOH
Esters CnH2n+1COOCmH2m+1 Carboxylate group
- COO -

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