Three tests (Q), (R) and (S) are done.
Test (Q). A compound X was fused with Na metal and the extract gave a white precipitate with  $AgN{O}_3$. The Lassaigne’s extract gave a red colouration with neutral  $FeC{l}_3$.
Test (R). Compound Y when fused with Na metal and subsequent analysis on its Lassaigne’s extract did not give any characteristic test.
Test (S). Compound Y on fusion with fusion mixture  $N{a}_2{O}_2$, followed by extraction, followed by addition of Conc.$HN{O}_3$ and ammoniummolybdate gave an yellow precipitate.
Answer the following Questions with above observations.