About 'X' and 'Y' the correct statements are
I. 'X' is inorganic acid 'Y' on oxidation with acidified KMnO4 gives organic acid
II. In 'X' central atom exhibit sp3 and in 'Y' 1st and 2nd carbon exhibit sp2 and sp3 hybridisations
III. Both 'X' and 'Y' acts as reducing agents
IV. Both 'X' and 'Y' are oxidized products in the reaction
X is H3PO3; Y is CH3 CHO