Alum powder is a crystalline powder that is most commonly used in pickling; it keeps pickles firm and crispy. THIS ALUM WILL NOT GROW CRYSTALS. Alum powder is often used to firm and crispen pickles by letting them soak in a sealed brine solution of water, vinegar, salt, spices, and alum powder for several weeks.
Glucose. Glucose (Glc), a monosaccharide (or simple sugar), is an important carbohydrate in biology. The living cell uses it as a source of energy and metabolic intermediate. Glucose is one of the main products of photosynthesis and starts cellular respiration in both prokaryotes and eukaryotes.glucose.-glucose is a short form of dextrorotatory glucose. It is one of the two stereoisomers of glucose, and is the one that is biologically active. It occurs in plant s as a product of photosynthesis. In animals and fungi, it is the result of the breakdown of glycogen.
In the case of RNA, the sugar in question is  the ribose sugar. Ribose sugar in RNA is almost indistinguishable  from its DNA counter part deoxyribose sugar. What separates  ribose from deoxyribose, is the presence of an oxygen molecule on  the sugar's second carbon, which deoxyribose lacks.