Q17 of 27 Page 1

Complete the following reactions :

a.


Explanation:


Ketones react with hydroxyl amines to form oximes. This is a type of addition-elimination reaction. The hydroxylamine group gets added and water is eliminated.


b.


Cyclohexenes are readily oxidised to carboxylic acids with common oxidising agents such as potassium permanganate (KMnO4) in acidic media to form hexane 1,6-dioic acid.


c.


Dibenzoic acids react with ammonia to give pthalimide at very high temperatures.


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15

An alcohol A (C4H10O) on oxidation with acidified potassium dichromate gives acid B (C4H8O2). Compound A when dehydrated with conc. Sulphuric acid 443 K gives compound C. Treatment of C with aqueous H2SO4 gives compound D (C4H10O) which is an isomer of A. Compound D is resistant to oxidation but compound A can be easily oxidized. Identify A, B, C and D. Name the type of isomerism exhibited by A and d.

 16

Which one of the following compounds will undergo faster hydrolysis reaction by SN1 mechanism? Justify your answer.


OR


A compound is formed by the substitution of two chlorine atoms for two hydrogen atoms in propane. Write the structures of the isomers possible. Give the IUPAC name of the isomer which can exhibit enantiomerism.

 18

Give reasons for the following:

(i) Use of aspartame as an artificial sweetener is limited to cold foods.


(ii) Metal hydroxides are better alternatives than sodium hydrogen carbonate for treatment of acidity.


(iii) Aspirin is used in the prevention of heart attacks.

 19

(a) Name the branched chain component of starch.

(b) Ribose in RNA and deoxyribose in DNA differ in the structure around which carbon atom?


(c) How many peptide linkages are present in a tripeptide?


OR


Give three reactions of glucose which cannot be explained by its chain structure