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19. Which one of the following molecules gives a positive Tollens' or Benedict's test? CH, O HOCH? CH.OH HO No Lo OH - a 0Q1,01, HO OH H HO O H HO. L CH,OH ON OH A B C CHI CH,OH O OH OH 10 CHO OH D E 20. An unknown disaccharide is subjected to methylation with CHil followed by acid hydrolysis. The reaction yields 2.3.4.6-tetra-O-methyl-D-glucose and 2.3.4-tri-O-methyl-D-glucose. Draw the structure of the unknown disaccharide. (Challenge Problem! Use your knowledge of organic chemistry to answer this