SOLVED TEST YOURSELFS
Test Yourself 13.1 (CARBOHYDRATES)
- No. i. Define carbohydrates.
Answer. Carbohydrates are defined as polyhydroxy aldehydes or ketenes. They have general formula Cn(H2O)n. They are macromolecules.
- No. ii. Give the characteristics of disaccharides.
Answer. Disaccharides give 2 units of monosaccharide’s on hydrolysis. These carbohydrates are white, crystalline solids and are easily soluble in water. They are also sweet in taste. They may be reducing or non-reducing in nature. The most important disaccharides is sucrose.
- No. iii. Give the balanced equation for the formation of glucose.
Answer. Glucose is formed from carbondioxcide and water through photosynthesis process. The balanced chemical equation, for formation of glucose is as follows:
6CO2 + 6H2O sunlight C6H12O6 +6O2
- No. iv. Draw the structure of glucose.
Answer. Glucose is a monosaccharide having formula C6H12O6 +6O2. It is pentahydroxy aldehyde consisting of six carbon atoms. Its structure is represented as:
- No. v. Give the balanced equation for the hydrolysis of sucrose.
Answer. Sucrose is a disaccharide having formula C12H22O11. The balanced equation for the hydrolysis of sucrose is given below. It produces one unit of glucose and one unit of fructose.
C12H22O11 + H2O Dil.HCl C6H12O6 + C6H12O6
heat glucose fructose