Q2 of 37 Page 1

write the structure of 2,4, dinitrochlorobenzene.

chloro-benzene implies benzene with a chlorine. Dinitro implies 2 NO2 groups and 2,4 denote that these groups are present at carbon positions 2,4 from chlorine carbon. So chlorine position is taken as 1 and accordingly NO2 are placed.


More from this chapter

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25

A. An element has atomic mass 93g mol–1 and density 11.5 g cm–3. If the edge length of its unit cell is 300 pm, identify the type of unit cell.

B. Write any two differences between amorphous solids and crystalline solids.


OR


A. calculate the number of unit cells in 8.1 g of aluminium if it crystallizes in a f.c.c. structure. (Atomic mass of Al = 27 g mol–1)


B. Give reasons :


(i) In stoichiometric defects, NaCl exhibit Schottky defect and not Frenkel defect.


(ii) Silicon on doping with Phosphorus forms an n-type semiconductor.


(iii) Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

 26

A. Write the product(s) in the following reactions:

(i)


(ii)


(iii)


(B) Give simple tests to distinguish between the following pairs of compounds :


(i) Ethanol and Phenol


(ii) Propanol and 2-methylpropan-2-ol


OR


(a) Write the formula of reagents used in the following reactions :


(i) Bromination of phenol to 2,4,6-tribromophenol


(ii) Hydroboration of propene and then oxidation to propanol.


(b) Arrange the following compound groups in the increasing order of their property indicated :


(i) p-nitrophenol, ethanol, phenol (acidic character)


(ii) Propanol, Propane, Propanal (boiling point)


(c) Write the mechanism (using curved arrow notation) of the following reaction :


 10

Write the reactions involved in the following:

(i) Hell-Volhard Zelinsky reaction


(ii) Decarboxylation reaction

 13

Write the principles of the following methods :

(i) vapour phase refining


(ii) zone refining


(iii) chromatography