Q13 of 26 Page 1

(i) Which one of the following is a polysaccharide :

Starch, maltose, fructose, glucose.


(ii) Write one difference between α-helix and β-pleated sheet structures of protein.


(iii) Write the name of the disease caused by the deficiency of vitamin B12


(i) Starch is a polysaccharide as it is a long chain of glucose molecules. Maltose is a disaccharide consisting of two glucose units. Fructose and glucose are monosaccharides.


(Image of starch, it is of a long chain of glucose molecules).



(Image of maltose, it consist of two glucose units).



(Image of Fructose)



(Image of Glucose)


(ii) The difference between α-helix and β-pleated sheet structures of protein are as follows.



(iii) Pernicious Anaemia is caused by the deficiency of Vitamin B12. It is characterized by RBCs deficient in haemoglobin. The deficiency occurs when the intestines in the human being cannot absorb enough Vitamin B12.


More from this chapter

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11

A solution is prepared by dissolved 10 g of non-volatile solute in 200 g of water. It has a vapour pressure of 31.84 mm Hg at 308 K. Calculate the molar mass of the solute.

(Vapour pressure of pure water at 308 K = 32 mm Hg).


 12

(i) Name the method of refining to obtain silicon of high purity.

(ii) What is the role of SiO2 in the extraction of copper?


(iii) What is the role of depressants in froth floatation process?


 14

(i) What type of isomerism is shown by the complex [Cr(H2O)6]Cl3?

(ii) On the basis of crystal field theory, write the electronic configuration for d4 ion if Δo > P.


(iii) Write the hybridization and shape of [CoF6]3.


(Atomic number of Co = 27).


 15

How can the following conversion be carried out:

(i) Aniline to bromobenzene


(ii) Chlorobenzene to 2-chloroacetophenone


(iii) Chloroethane to butane.


OR


What happens when


(i) chlorobenzene is treated with Cl2/FeCl3.


(ii) Ethyl choride is treated with AgNO2.


(iii) 2-bromopentane is treated with alcoholic KOH?


Write the chemical equations in support of your answer.