Explanation
Aldehydes and α- hydroxy ketones give positive Tollen’s test. Glucose has an aldehydic group and fructose is a α-hydroxy ketone
Lactose is the major carbohydrate in milk of most species. Lactose is a disaccharide composed of the monosaccharides D – glucose and D – galactose, joined in a β – 1, 4 – glycoside linkage. Hence the constituents of lactose are β – D-glucose and β – D-glucose
An aldohexose has 6 carbon atoms and an aldehyde group. Hence glucose is an aldohexose.
Glucose pentaacetate doesnot contain free –OH group at C-1 , it cannot get hydrolysed in aqueous solution to produce the open chain aldehydic form and thus Glucose pentaacetate doesnot react with NH2OH to form glucose oxime.
Glucose gives silver mirror with ammoniacal silver nitrate because it has aldehyde group at C-1 position
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