Introduction
The properties of an organic molecule are determined largely by the reactive part of the molecule. This reactive part is called functional group. Compounds with the same function group
Organic compounds can be classified based on active part in the compounds. The active part is called the functional group.
Hydrocarbons: alkanes and alkenes
Alkanes and alkenes are hydrocarbons, i.e. they only contain hydrogens and carbons. Alkanes only contain single carbon – carbon bond, while alkenes contain at least one double carbon – carbon bond.
Halogenoalkanes and alcohols
In halogenoalkanes
Aldehydes and ketones
Both aldehydes and ketones contain carbonyls. In an aldehyde, the carbonyl is at the end of the carbon chain, while in a ketone, the carbonyl is never at the end of the carbon chain.
Carboxylic acids and esters
Carboxylic acids and esters have the same general formula, CnH2nO2, but different functional groups.
Amines and nitriles
Both amines and nitriles contain nitrogens.
Test yourself
Checklist
Can I
- define the term hydrocarbon?
- identify the following classes of compounds from the functional group present: alkane, alkene, halogenoalkane, alcohol, aldehyde, ketone, caboxylic acid, ester, amine and nitrile?