For the following reaction scheme, percentage yields are given along the arrow: red hot iron tube 873 K 40% MgC3 HO The value of x is P (4.0 g) Hg2+/H* 100% 333K S NaNH, Mel 75% Ba(OH)2 heat 80% T NaOCI 80% X g and y g are mass of R and U, respectively. (Use: Molar mass (in g mol'') of H, C and O as 1, 12 and 16, respectively) R (x g) U (decolourises (yg) Baeyer's reagent)