Can some help me answer this, with reasons or supporting Articles from Oblicon or law on sales and its application and conclusion? Thanks.

l. D borrowed P30530000 from C. To secure the debt. D pledged his ring. wrishyatch. and necklace. Before the debt could be paid. C died leaving it. Y and I as heirs. By agreement among the heirs who inherited the credit. the ring would secure the shine at x of the credit. the mfstwatch the shore of 'r. a necklace the shore of 1. Later. D pays I Pl0.000.m. Con El demand the exfhguishment of the pledge of the rlng'i' 2. K. of Y's request. executed a Real Estate Mortgage {REM} on his [it's] land to secure Y's loan from I. I successfully foreclosed the REM when '1' defaulted on the loan but hail of Y's obligation remained unpaid. May I sue x to enforce his right to the deficiency? 3. A shops of supermarket. buys groceries worth Pl .000. and pays with on unfunded check and goes home with the groceries. The check is dishonored for lock of funds. Is there estato? 4. Please refer to number 3. if the grocer. knowing A. allows him to pay on a later date. g'onting then only credit on the goods. and offer a few days. A pays with a check that eyentuolty bounces. Is there estofo