... Which substance can enter redox reaction with FeCl 3 and exchange reaction with AgNO 3 ? Write both reactions. (2 points) [Solution] . ... Write two S E reactions with the least active substance. (2 points) [Solution] . ... Write the reactions involved in the following sequence of transformations: . Determine the functional groups X and Y. Specify the conditions of all reactions. (3 points) [Solution] . ... Example Problems in Chemistry for the Entrance Exams ( preliminary round ) . ...