Define the following with an example:Polysaccharides from Class

Subject

Chemistry

Class

CBSE Class 12

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

41.

Write the structures of the main products in the following reaction:


42.

Write the structures of the main products in the following reaction:


43.

(A), (B) and (C) are three non-cyclic functional isomers of a carbonyl compound with molecular formula C4H8O .
Isomers (A) and (C) give positive Tollen’s test whereas isomer (B) does not give Tollen’s test but gives positive Iodoform test. Isomers (A) and (B) on reduction with Zn(Hg)/conc. HCl give the same product (D).

(a) Write the structures of (A), (B), (C) and (D)
(b) Out of (A), (B) and (C) isomers, which one is least reactive towards addition of HCN ?


44.

Write the structure of the product when chlorobenzene is treated with methyl chloride in the presence of sodium metal and dry ether.


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45.

Write the structure of the alkene formed by dehydrohalogenation of 1-bromo-1-methylcyclohexane with alcoholic KOH.


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46.

Define the following with an example:

Polysaccharides


Polysaccharides are polymeric carbohydrate molecules composed of long chains of monosaccharide units bound together by glycosidic linkages for example starch.


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47.

Define the following with an example:

Denatured protein


48.

Define the following with an example:

Essential amino acids


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49.

Write the product when D-glucose reacts with conc. HNO3


50.

Amino acids show amphoteric behaviour. Why?


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