20. Which of the following statements is correct?
(A) A chiral compound will always react to give a chiral product.
(B) The most stable conformation of tert-butylcyclohexane is with the tert-butyI group at the axial position.
(C) Aryl amines can be synthesized by reduction of nitroarenes.
(D) The Diels-Alder reaction involves rearrangement of electrons between the two HOMOs of the two reactants.
(E) A hard nucleophile will prefer to react with an α.β-unsaturated carbonyl compound in 1,4- addition instead of 1,2-addition.