Subject

Chemistry

Class

CBSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
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 Multiple Choice QuestionsShort Answer Type

51.

Do the following conversions in not more than two steps :
Ethyl benzene to Benzoic acid

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52.

Do the following conversions in not more than two steps :
Propanone to Propene

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53.

Write the structures of the monomers used for getting the following polymers:
Dacron

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54.

Write the structures of the monomers used for getting the following polymers:
Melamine – formaldehyde polymer

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55.

Write the structures of the monomers used for getting the following polymers:
Buna-N

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56.

Define the following :
Anionic detergents

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57.

Define the following :
Broad spectrum antibiotics

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58.

Define the following :
Antiseptic

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59.

Give reasons:
Acetylation of aniline reduces its activation effect.

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60.

Give reasons :
CH3NH2 is more basic than C6H5NH2.


CH3NH2 is more basic than C6H5NH2 due to +I effect in methylamine, electron density in methylamine at nitrogen increases whereas in aniline resonance takes place and electron density on nitrogen
decreases.

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