One of the examples of homologous series is given below: HCOOH, CH2COOH, X, CH3CH2CH2COOH a) Define homologous series. b) Find the mass difference between successive member of above homologous series and calculate the molecular mass of 'X'. c) What is functional group of the above series? What secondary suffix is used for it.​

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.