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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.

In case of aromatic carboxylic acid –COOH attach to the Benzene ring having an electron withdrawing effect and deactivated the benzene ring, hence do not exhibit Friedel craft reaction.