(a) In organic compounds, which part largely determines the physical and chemical properties.
(b) Write chemical equation to represent the reaction of ethanol with acidified solution of potassium dichromate.
(a) In organic compounds, it is the functional group which largely determines the physical and chemical properties of compounds. Actually, an organic compound is made up of two parts. These are alkyl group and the functional group. Whereas the alkyl group remains the same (size may change) but the functional groups change. These are responsible for the characteristics of the compounds. For example, the properties of alkanols (–OH is the functional group) are different from those of alkanoic acid (–COOH is the functional group).
(b)Acidified solution of potassium dichromate ( K2Cr2O7 ) forms chromic acid ( H2Cr2O4 ). It releases oxygen to bring about the oxidation of ethanol first to ethanal and then to ethanoic acid.