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1.

Define the following terms : (i) Polysaccharides (ii) Glycosidic bond 

Answer»

(i) Carbohydrates which yield a large no. of monosaccharide units on hydrolysis are called polysaccharide. 

(ii) It is a linkage between two monosaccharide units through oxygen atom is called glycosidic linkage or bond. 
Discussion
2.

Explain what is meant by following: 1. Oligosaccharide 2. Glycosidic linkage

Answer»

1. Oligosaccharide- Carbohydrate which on hydrolysis give 2 to 10 molecules of monosaccharide are called oligosaccharide. e g. sucrose. 

2. Glycosidic linkage- It is a linkage between two monosaccharide units through oxygen atom is called glycosidic linkage or bond. 
Discussion
3.

Glucose or Sucrose are soluble in water but cyclohexan or benzene are insoluble in water explain. 

Answer»

Glucose contains 5–OH group and sucrose contain 8–OH group. These –OH group form H-bond with water, Because of this extensive intermolecular H-bonding glucose and sucrose soluble in water, on the other hand benzene and cyclohexane do not form H bond and insoluble in water. 
Discussion
4.

Write two main test which could not explain straight chain structure. 

Answer»

(i) It dose not give Schiff’s test. 

(ii) IT dose not form the hydrogensulphite addition product with NaHSO3. 
Discussion
5.

What are the hydrolysis products of a. Sucrose b. Lactose 

Answer»

 a. Glucose and fructose 

b. Glucose and galactose 
Discussion
6.

Write two main fuctions of carbohydrates in plants. 

Answer»

i.Structural material for cell walls- The polysaccharide cellulose act as the chief structural material for the cell wall. 

ii. Reserve food material- The polysaccharide starch is the major reserve food material in the plants. 
Discussion
7.

How do you explain the presence of an aldehyde group in @ glucose molecule ? 

Answer»

Glucose reacts with hydroxyl amine to form an oxime, this reaction confirms the presence of a carbonyl group in glucose. 
Discussion