PART II BOOK CLASS XII CHEMISTRY
PART II BOOK CLASS XII CHEMISTRY.
Instructions:
* Answer all the questions:
* Questions 1 to 8 carry one mark each. Answer them in one word or a sentence.
* Questions 9 to 18 carry 2 marks each. Answer them in 20 to 30 words.
* Questions 19 to 27 carry 3 marks each. Answer them in 40 to 50 words.
* Questions 28 to 30 carry 5 marks each. Answer them in 70 words.
* Calculator or any other electronic items are not allowed. However logarithm book may be used for calculations
1 Why are amines less acidic than comparable alcohols?
2 Give the IUPAC name of the compound CHF2CBrClF.
3 Give one chemical test to distinguish the following compounds.
Ethanol and Phenol.
4 Mention a chemical property in which methanoic acid differs from aceticacid.
5. Why is vitamin C not stored in our body?
6. Why do we require artificial sweetening agents?
7. What is meant by co polymerisation ?
8. What are the monomers of Bakelite ?
9. What are essential and non-essential amino acids? Give two examples of each
type ?
OR
What is the difference between a nucleoside and a nucleotide?
10. What is isoelectric point of aminoacid ? How does it help in the separation of amino
acid?
11. Out of phenol and benzene, which is more easily nitrated and why ?
12. Explain why is Ortho – nitrophenol more acidic than Ortho – methoxyphenol ?
13. Benzaldehyde gives a positive test with Tollen’s reagent but not with fehling and Benedicts solution. ?
14.i) Aniline is weaker base than methyl amine ?
ii) Ammonolysis of alkyl halide does not give a corresponding amine in pure state. ?
15. How are antiseptics distinguished from disinfectants ?Give two examples of each.
16. Give chemical test to distinguish between:
i) Acetaldehyde and benzaldehyde
ii) Benzaldehyde and benzoic acid.
17. Write the mechanism of acid dehydration of ethanol to yield ethene.
18. Explain
i) Aldehydes are more reactive than ketones in nucleophilic addition reaction.
ii) Propanal is higher boiling than propanone.
19. a) Write short note on Gabriel phtalimide synthesis. (3)
b) Convert aniline to phenol.
c) Draw the structure of the zwitter ion of sulphanilic acid.
20.Define the following with relation to proteins:-
a) Peptide linkage.
b) Primary structure.
c) Denaturation.
21. a) Convert carbondioxide to acetic acid. (1)
b) Convert butanal to butanoic acid. (1)
c) Convert ethylbenzene to benzoic acid.
22. What happens when D-glucose is treated with:- (3)
a) HI.
b) Bromine water.
c) Nitric acid.
23.i) Name the monomers of PHBV and its uses.
ii) Name a narcotic analgesic.
24.i)What is Aldol condensation? Explain with example. (2)
ii_)Explain Cannizzaro’s reaction.
25. Distinguish between thermoplastics and thermosetting plastics.
26.What are essential amino acids? Give an example for each.
27.i) Why are primary amines higher boiling than tertiary amines?
ii) What will be the basic strength order of EtNH2, Et2NH, Et3N in gas phase ? Explain.
28. An organic compound with molecular formula C8H16O2(A) was hydrolysed with dil. Sulphuricacid to give a carboxylic acid and an alcohol C.oxidation of C with K2Cr2O7 gave B. C, ondehydration gives but-1-ene. Write equations involved.
29.i)Aldehydes are generally more reactive than ketones in nucleophilic addition
reactions. Why?
ii)Write the chemical equation for the following:
a) Esterification b)Aldol condensation c)HVZ reaction
30)a) Write the chemical reactions to effect the following conversions:
i)Butan-1-ol to Butanoic acid
ii) Benzoyl chloride to Benzaldehyde
iii) Ethanoic acid to propanone
b) How are the following pairs of compounds distinguished:
i) Phenol & benzoic acid ii) Pentan-2-one & Pentan-3-one.
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