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CBSE Class 12 Chemistry Solved Question Paper 2013

Short Answer Type

31.

What are three types of RNA molecules which perform different functions?

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32.

Chlorobenzene is extremely less reactive towards a nucleophilic substitution reaction. Give two reasons for the same?

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33.

Explain the mechanism of the following reaction:

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34.

How will you convert

Propene to Propan-2-ol?

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35.

How will you convert

Phenol to 2, 4, 6- trinitrophenol?

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36.

Give the structures of A, B and C in the following reactions:

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37.

Write the names and structure of the monomers of the following polymers:

(i) Buna- S

(ii) Neoprene

(iii) Nylon-6, 6

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38.
After watching a programme on TV about the adverse effects of junk food and soft drinks on the health of school children, Sonali, a student of Class XII, discussed the issue with the school principal. Principal immediately instructed the canteen contractor to replace the fast food with the fibre and vitamins rich food like sprouts, salad, fruits etc. This decision was welcomed by the parents and the students.

After reading the above passage, answer the following questions:

(a) What value are expressed by Sonali and the Principal of the school?

(b) Give two examples of water-soluble vitamins.

(a) The values showed by Sonali are awareness regarding adverse effect of junk food and concern for the health of her school mates.

The value showed by the principal is responsible behaviour in listening to Sonali’s views and taking prompt action in replacing junk food with healthy food.

(b) The water soluble vitamins are vitamin B-complex and vitamin C.

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