Q18 of 37 Page 1

Write structures of compounds A, B and C in each of the following reactions :

A.


B.


Do the following conversions in not more than two steps :


(i) Benzoic acid to benzaldehyde


(ii) Ethyl benzene to Benzoic acid


(iii) Propanone to Propene

A.


A is phenyl magnesium B is benzoic acid C is benzoyl chloride bromide


B.


A is Acetaldehyde B is 3-hydroxy butanal C is but-2-nal


(i) Benzoic acid to benzaldehyde



Rosenmund reduction


Benzoic acid benzoyl chloride benzaldehyde


(ii) Ethyl benzene to Benzoic acid



Ethyl benzene potassium benzoate benzoic acid


(iii) Propanone to Propene



Propanone propan –2-ol propene


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16

Following compounds are given to you :

2-Bromopentane, 2-Bromo-2-methy-lbutane, 1-Bromopentane


(i) Write the compound which is most reactive towards reaction.


(ii) Write the compound which is optically active.


(iii) Write the compound which is most reactive towards β–elimination reaction.

 17

A. Write the principle of method used for the refining of germanium.

B. Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferably?


C. What is the significance of leaching in the extraction of aluminimum?

 19

Write the structures of the monomers used for getting the following polymers : (i) Dacron (ii) Melamine – formaldehyde polymer (iii) Buna-N

 20

Define the following :

(i) Anionic detergents


(ii) Broad spectrum antibiotics


(iii) Antiseptic