Identify and name the functional groups present in the following compounds.

(a) Propanol (C₃H₇OH). It is commonly represented by the molecule propan-1-ol, a primary alcohol. It has –OH functional group.

(b) Carboxylic acid. It is an organic compound that contains a carboxyl group [C(=O)OH]. The general formula of a carboxylic acid is R–COOH. It has –COOH functional group.

(c) Ketone. It is an organic compound with the structure RC(=O)R'. Here R and R' can be a carbon-containing compounds. Ketones and aldehydes are simple compounds that contain a carbon–oxygen double bond (carbonyl group). It has carbon–oxygen double bond functional group.

(d) Alkene. These are hydrocarbons that contain a carbon–carbon double bond. The number of hydrogen atoms in an alkene is just double the number of carbon atoms. For example, the number of hydrogen atoms in ethane (C₂H₄) is 4 and that of carbon is 2. In propene (C₃H₆), the number of hydrogen atoms is 6 and that of carbon is 3. It carbon-to-carbon double bond functional group.