Which of the following can form cyclic anhydride only on heating?

Which of the following forms cyclic anhydride

Which of the following is a mixed acid anhydrid

Which of the following gives a cyclic anhydride on heating?

Which of the following form a mixed anhydride?

Which of the following is not an acid anhydride ?

Which of the following acid will form an (a) Anhydride on heating and (b) Acid amide on strong heating with ammonia?