Problem
To which classes of sugars do the following monosaccharides belong? Which is D and which is L?

Text Books
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P. Y. Bruce and K J R. Prasad, Essential Organic Chemistry , Pearson Education, New Delhi, 2008.
R. R. Morrison, R. N. Boyd and S. K. Bhattacharjee, Organic Chemistry , Dorling Kindersley (India) Pvt. Ltd, New Delhi, 2011.