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ISC Class 12 Chemistry Solved Question Paper 2010

Short Answer Type

31. Draw three isomers of a compound with the molecular formulae C₃H₉N. Name the isomers.

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32.

Give one good chemical test to distinguish between the following pairs of compounds:

(i) 1 Propanol and 2 Propanol.
(ii) Oxalic acid and benzoic acid.

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33. (i)Identify the products A, B, C and D.

$CH subscript 3 COOH space rightwards arrow with PCl subscript 3 on top space straight A space rightwards arrow with NH subscript 3 on top straight B rightwards arrow with NaOH on top space straight C plus straight D ii right parenthesis space Identify space the space reagents space straight W comma space straight X comma space straight Y space and space straight Z straight C subscript 6 straight H subscript 6 space rightwards arrow with straight W on top space straight C subscript 6 straight H subscript 5 SO subscript 3 straight H space rightwards arrow with straight X on top straight C subscript 6 straight H subscript 5 ONa rightwards arrow with straight Y on top space straight C subscript 6 straight H subscript 5 OH rightwards arrow with straight Z on top straight C subscript 6 straight H subscript 5 OCOCH subscript 3$

(i) A = Acetylchloride (CH₃COCl)

B = Acetamide (CH₃CONH₂)

C = Sodium acetate (CH₃ COONa)

D = Ammonia (NH₃)

(ii) W = H₂ SO₄ Y = HCl

X = NaOH Z = CH₃ COCl

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34.

(i) What are thermoplastics and thermosetting plastics? Give one example of each kind.

(ii) Give one example of a fibrous protein. Name the final product of hydrolysis of proteins. What is denaturation of proteins?

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35.

Give balanced equations for the following reactions:

(i) Benzaldehyde treated with hydrogen cyanide.

(ii) Chlorine is passed through diethyl ether.

(iii) Benzoic acid solution is treated with sodium carbonate.

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36. An organic compound A with molecular formula C₃H₈0₃ reacts with oxalic acid at 110 C to give a monocarboxylic acid B. B gives a silver mirror with Tollen’s reagent and reduces acidified potassium permanganate solution. Identify A and B and give the reaction of B with acidified KMn0₄ solution.

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