Functional group:
1. The atom or group of atoms present in the molecule which determines characteristic property of organic compound is called the functional group.
2. All organic compounds are considered as derivatives of hydrocarbons, it is formed by replacing one or more hydrogen atom in a molecule by some other atom.
3. In methane CH4, if one hydrogen is replaced by an –OH group, then compound methyl alcohol. CH3.OH is formed. The –OH group is the alcoholic functional group.
4. After replacement, a new compound has functions i.e. properties different from the parent hydrocarbon.
