【单选题】One day a car rental agency rented 2/3 of its cars, including 3/5 of its cars with CD players. If 3/4 of its cars have CD players, what percent of the cars that were not rented had CD players?
【简答题】某化合物的分子式为C 7 H 7 O 2 N(A),无碱性,还原后得C 7 H 9 N(B)具有碱性。B在低温及强酸存在下,和亚硝酸作用生成C 7 H 7 N 2 Cl(C)。将此化合物C的水溶液加热时,放出N 2 ,并生成对甲基苯酚。在碱性溶液中,化合物C与苯酚作用生成具有颜色的化合物C 13 H 12 ON 2 ,请写出A、B、C、D的构造式和各步的反应式。