1. All Diels-Alder reactions a. require a diene b. require a dieneophile c. are pericyclic reactions d. all of the above 2. All electrophilic aromatic substitution (EAS) reactions require a. the generation of an electrophile b. an aromatic ring attack the electrophile to form an arenium ion c. the regeneration of the aromatic ring d. all of the above 3. The gas generated in Sandmeyer reactions is a. oxygen b. nitrogen c. methane d. carbon dioxide 4. Cyclohexanol has a much higher boiling point than cyclohexene because a. cyclohexanol has induced dipole and cyclohexene has hydrogen bridge bonding b. cyclohexanol has hydrogen bridge bonding and cyclohexene has induced dipole c. cyclohexene can pack together b

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.

answerambulatory;