Subject

Chemistry

Class

CBSE Class 12

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

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31.

Arrange the following compounds in increasing order of solubility in water:

C6H5NH2, (C2H5)2NH, C2H5NH2


The increasing order of solubility in water of the given compounds is as follows:

 C6H5NH2 < (C2H5)2NH < C2H5NH2

The more extensive the hydrogen bonding, the higher is the solubility of the compound in water. C2H5NH2 contains two H-atoms, whereas (C2H5)2NH contains only one H-atom. Therefore, C2H5NH2 is more soluble than (C2H5)2NH. The solubility of C6H5NHis least due to its high molecular mass.

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32.

Which of the two components of starch is water soluble?

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33.

Which alkyl halide from the following pair is chiral and undergoes faster SN2 reaction?

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34.

Out of SN1 and SN2, which reaction occurs with

(a) Inversion of configuration

(b) Racemisation 

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35.

Draw the structure of major monohalo product in each of the following reactions: 
i) 


ii) 

 

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36.

Give two examples of macromolecules that are chosen as drug targets.

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37.

What is antiseptics? Give an example.

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38.

Why is the use of aspartame limited to cold foods and soft drinks?

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39.

Deficiency of which vitamin causes night-blindness ?

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40.

Name the base that is found in nucleotide of RNA only.

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