How will you bring about the following conversions :    (i) Ac

Subject

Chemistry

Class

ICSE Class 12

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

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31.

How will you bring about the following conversions :   

(i) Acetaldehyde to acetamide.

(ii) Phenol to benzoic acid

(iii) Glucose to saccharic acid.


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32. Give the names of the following reactions:

straight i right parenthesis space straight C subscript 2 straight H subscript 5 Br space plus straight C subscript 2 straight H subscript 5 ONa space rightwards arrow straight C subscript 2 straight H subscript 5 OC subscript 2 straight H subscript 5 space plus NaBr

ii right parenthesis space CH subscript 3 CHO space plus CH subscript 3 COCH subscript 3 space rightwards arrow with OH to the power of minus on top space CH subscript 3 CH left parenthesis OH right parenthesis CH subscript 2 COCH subscript 3

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33.

How will you distinguish between the following pairs of compounds ? (Give one good chemical test.)   

(i) Ethylamine and Acetamide    
(ii) Oxalic acid and Acetic acid.

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34. An organic compound A with molecular formula C2H7N on reaction with nitrous acid gives a compound B. B on controlled oxidation gives a compound C. C reduces Tollen’s reagent to give silver mirror and D. B reacts with D in the presence of concentrated sulphuric acid to give a sweet smelling compound E. Identify A, B, C, D and E. Give the reaction of C with ammonia and name the product. 
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35. Draw the isomers of a compound with the molecular formula C4H4O4. Name the isomers.  
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36.

What type of polymerisation takes place when a polyester is formed? Give one example of a polyester and name the monomers from which it is formed.   

(ii) Give two examples of natural polymers.

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37.

Identify the products A, B, C and D.    

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38.

 Give balanced equations for the following reactions:   

(i) Formic acid heated with Tollen’s reagent.

(ii) Phenol heated with chloroform and sodium hydroxide.

(iii) Acetaldehyde reacted with phenyl hydrazine.

(iv) Aniline treated with benzoyl chloride.

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 Multiple Choice QuestionsLong Answer Type

39.

i) Write the mathematical expression for the first law of thermodynamics.

One mole of an ideal gas is expanded isothermally against a constant pressure of 3 atmospheres from 10 litres to 35 litres. Calculate the work done, change in internal energy and heat absorbed during the process.    

(ii) Calculate the free energy change of the reaction:

C(graphite)+O2 (g) →CO2(g) ΔH = - 300 kJ mol-1 and AS = 3JK-1 mol-1 at 300 K.

Predict whether the reaction is spontaneous or not at 300 K.

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40. Describe the extraction of silver from its sulphide ore by the cyanide process.
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