Why do you think the reaction between and dimethyl acetylenedicarboxylate can be conducted at relatively lower temperature compared to the reaction between and diphenylacetylene?

See explanation

Explanation:

The reaction between and dimethyl acetylenedicarboxylate as well as the reaction of   and diphenylacetylene are  Diels Alder reactions. The former is performed in presence of a solvent while the former is performed neat.

The reaction of and dimethyl acetylenedicarboxylate leads to the formation of a more resonance-stabilized aromatic ring(lower energy product) compared to the reaction of   and diphenylacetylene.

Hence, the reaction between and dimethyl acetylenedicarboxylate can be conducted at relatively lower temperature compared to the reaction between and diphenylacetylene.

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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.