Which of the following dienes could react with acrylonitrile in a Diels-Alder reaction? 
Definitions:
Entropy
Disorderliness; a quantitative measure of the amount of the random, disordered energy that is unavailable to do work.
Cofactor
A nonprotein substance needed by an enzyme for normal activity; some cofactors are inorganic (usually metal ions); others are organic (coenzymes).
Enzymes
Biological catalysts that speed up chemical reactions in cells without being consumed in the process.
Enthalpy
Enthalpy is a measurement of the total heat content of a system, reflecting the energy needed to create a system and the energy needed to make room for it by displacing its environment.
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