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 Identify 'X' in the following reaction.

 

Option: 1

Sucrose

 


Option: 2

Lactose

 


Option: 3

Maltose

 


Option: 4

Starch


Answers (1)

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When sucrose \mathrm{\left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right)} is boiled with dilute \mathrm{\mathrm{HCl}} or \mathrm{\mathrm{H}_2 \mathrm{SO}_4} in an alcoholic solution, glucose and fructose are obtained in equal amounts. This is one of the methods used for preparation of glucose and called hydrolysis of sucrose. On hydrolysis, lactose gives galactose and glucose. Maltose on hydrolysis gives two molecules of glucose only. Starch being a polysaccharide, give many monomers of glucose.

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