(a) D-glucose reacts with hydroxylamine () to form an oxime because of the presence of aldehyde (-CHO) group or carbonyl carbon. This happens as the cyclic structure of glucose forms an open chain structure in an aqueous medium, which then reacts with to give an oxime.
(b) Amino acids show amphoteric behaviour because in aqueous solution, the carboxyl group of an amino acid can lose a proton and the amino group can accept a proton to give a zwitter ion. In this form, the amino acid can act both as an acid and as a base.
(c) Vitamin C cannot be stored in our body because our body can't make it, and it is a water-soluble vitamin. This means it dissolves in water. Therefore, it is needs to be taken from outside source which then can be utilised by out body.
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