An optically active compound X, C7H12, yields an optically active product Y, C7H16, when treated with excess hydrogen and a catalyst. Treatment of X with Ag(NH3)2 (silver diamine complex), yields a solid Z. When X is treated with H2O/H2SO4, an optically active product W, C7H14O, is formed. Draw the structures of X, Y, Z, and W.