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CBSE Class 12 Chemistry Solved Question Paper 2018

Short Answer Type

31.

When concentrated sulphuric acid was added to an unknown salt present in a test tube a brown gas (A) was involved. This gas intensified when copper turnings were added to this test tube. On cooling, the gas (A) changed into a colourless solid (B).
(i) Identify (A) and (B)
(ii) Write the structures of (A) and (B)
(iii) Why does gas (A) change to solid on cooling

32.

Arrange the following in the decreasing order of their reducing character:

HF, HCl, HBr, HI

33.

Complete the following reaction:
xeF4 + SbF5 -->

34.

Write the IUPAC name of the following:

35.

Out of chlorobenzene and benzyl chloride, which one gets easily hydrolysed by aqueous NaOH and why?

36.

How do you convert the following?

Ethanal to Propanone

37.

How do you convert the following?

Toluene to Benzoic acid

38.

Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.

39.
pK_a value of 4-nitrobenzoic acid is lower than that of benzoic acid.

It is due to e^– with drawing nature of –NO2 attach at the para position of Benzene due to which tends to lose H⁺ ion increases and acidic character increases.