Q22 of 26 Page 1

a) Write the product obtained when D-glucose reacts with

b) Amino acids show amphoteric behaviour. Why?


c) Why cannot vitamin C be stored in our body?


(a) D-glucose reacts with hydroxylamine () to form an oxime because of the presence of aldehyde (-CHO) group or carbonyl carbon. This happens as the cyclic structure of glucose forms an open chain structure in an aqueous medium, which then reacts with to give an oxime.

(b) Amino acids show amphoteric behaviour because in aqueous solution, the carboxyl group of an amino acid can lose a proton and the amino group can accept a proton to give a zwitter ion. In this form, the amino acid can act both as an acid and as a base.


(c) Vitamin C cannot be stored in our body because our body can't make it, and it is a water-soluble vitamin. This means it dissolves in water. Therefore, it is needs to be taken from outside source which then can be utilised by out body.


More from this chapter

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20

I) How will you convert the following:

a) to


b) Aniline to phenol


c) Ethanenitrile to ethanamine


II) Write the chemical equations involved when aniline is treated with the following reagents:


i) water


ii)


iii) HCl


 21

Write the names and structures of the monomers of the following:

a) Buna S


b) Glyptal


c) Polyvinyl Chloride


 23

Seeing the growing cases of diabetes and depression among young children, Mr. Lugani, the principal of one reputed school organised a seminar in which he invited parents and principals. They all resolved this issue by strictly banning junk foods in schools and introducing healthy snacks and drinks like soup, lassi, milk etc in school canteens. They also decided to make compulsory half an hour of daily physical activities for the students in the morning assembly. After six months, Mr. Lugani conducted a health survey in most of the schools and discovered a tremendous improvement in the health of the students.

After reading the above passage, answer the following questions:


a) What are the values (at least two) displayed byMr. Lugani?


b) As a student, how can you spread awareness about this issue?


c) What are antidepressant drugs? Give an example.


d) Name the sweetening agent used in the preparation of sweets for diabetic patient.


 24

I) a) A compound ‘A’ of molecular formula undergoes a series of reactions as shown below. Write the structures of A, B, C and D in the following reactions.


b) Distinguish between the following:


i) and


ii) Benzoic acid and methyl benzoate


c) Write the structure of 2-methylbutanal.


II) a) Write the structures of the main products when acetone ) reacts with the following reagents:


i) Zn- Hg/conc HCl


ii)


iii)


b) Arrange the following in the increasing order of their boiling points:


, ,


c) Give a simple chemical test to distinguish between the following pair of compounds:


and