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Explain why : (i) Glucose is soluble in waterbut cyclohexaneis not. (ii) Aldehyde group is absentin the penta acetate of D - glucose . (iii) Vitamin A isessanital for us . |
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Answer» Solution :(i) Glucosehasfive - OH groupswhichformhydrogen bondwith water . Dueto thisextensiveintermolecular hydrogen bonding, glucoseis solublein water . Cyclohexane is non -polar molecule with no-OH group, henceit does not DISSOLVE in polarsolventwater . (ii) PentaacetateD - GLUCOSE does not CONTAIN any free aldehyde group as it is a cylic STRUCTUREOF glucose . It isthis cyclic STRUCTURE of glucosein acetylationforms penta acetate of D- glucose .  (iii)Defficiency of vitamin A causes night blindness and xerophthalma (chardeingof cornea of eye). Thatis why vitamin A is essentail for us . |
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