Non-conjugated β, γ-unsaturated ketones, such as 3-cyclohexenone, as in base-catalyzed equilibrium with their α,β-unsaturated isomers. An interesting consequence of this isomerization of unsaturated ketones is that 2-substituted cyclopentenones, such as 2-methyl-2-cyclopentenone, can be interconverted with 5-substituted 2-cyclopentenones. The first intermediate in this reaction has three resonance structures.
Draw all resonance structures for the first intermediate in the conversion of 2-methyl-2-cyclopentenone to 5-methyl-2-cyclopentenone.

See the attached file for the structure.

Explanation:

Find attached for the explanation

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.