Class – XII
Subject : Chemistry 2nd Paper
Time : 3 hrs. Marks. 75
Group -A
1. (a) Describe laboratory preparation of ethane. 5
(b) Write short notes on (i) Carbil amine test (ii) Hofmann Degradation. 2x2 =4
(c) Explain that 1-alkyne forms acetalide but 2- alkyne does not form it? 3
(d) Show with equation that chlorine is a bleaching agent. 3
Or, (a) Describe the principle of preparation of ammonia by Haber- Bosch process. 5
(b) What is aqua regia? How gold or platinum disslved in it? 4
(c) Write down the name and formula of the possible isomers dinitro toluene. 3
(d) Explain that toluene is ortho para director. 3
2. (a) Describe the process of preparation of benzene from coal for or coal gas. 5
(b) What is Zwitter ion? Write down its nature in acid and basic solution. 4
(c) Write down an identification test between alcoholic -OH and phenolic -OH gr. 3
(d) What is formation ? How is it prepared? Write down its uses? 3
Or, (a) What is brine? Describe the principle of preparation of chlorine by electrolysis of brine. 5
(b) What happens when - (i) Metallic iodide is heated with H2 SO4. 2x2=4
(ii) Chlorine passes through dil. NaOH Sol2.
(c) Explain that transition elements form complex compounds. 3
(d) Write down the electronic configuration of Fe +3, Ni, cu+ . 3
3. (a) What is fermentation? Describe the process how ethanol is prepared from starch by 5
fermentation.
(b) How can you synthesize the following compounds--
(i) Aspirin (ii) D. D. T. 2x2 =4
(c) Explain with example SP hybridization. 3
(d) What is Lucas reagent? What is the use of it? 3
Or, (a) Describe laboratory preparation of aniline. 5
(b) Write down two process of preparation of ester. 4
(c) Write the difference between DNA and RNA. 3
(d) What is Soap and detergent? 3
Group -B
4. (a) Write the formula of --- (i) Calamine (ii) Magnetite (iii) Limonite. 3
(b) What is Ligand? 2
Or, (a) What is the difference between free radial and ions? 3
(b) Explain that carbon is a tetravalency compounds. 2
5. (a) Write down the structural formula of the following -
(i) Phosgene gas (ii) Methyl phenyl ether (iii) Glycene. 3
(b) What is Markovnikov's rule? 2
Or, (a) Write down the formula of -
(i) T. N. B (ii) D - lactic acid (iii) Amylose. 3
(b) What do you mean by delocalization of benzene? 2
6. (a) Write down an identification test of unsaturation. 3
(b) How will you get - 2
(i) Toluene from chlorobenzene.
(ii) Glyoxal from ethyne.
Or, (a) Write down the following interconver sions. 5
(i) Benzene Benzoic acid 
(ii) phenol Toluene 
(iii) Aniline Phenol 
(iv) Benzaldehyde Chlorobenzene (v) Ethene Ethyne. 7. Complete the following veactions --
CH3
(a) (i) O + R ´ 
? OH
(ii) O + Zn 
? CH3
(iii) O + [O] 
? O
11
(b) How ( - C - ) is identified? 2
Or, (a) How benzene diagonium chloride is prepared from benzen? Explain. 3
(b) Explain that thovgh amino group is an ortho-para directing group but in case of nitration
it gives meta product. 2
8. (a) How you will synthesize 3
(i) Melamine from carbamide.
(ii) Aniline from Toluene.
(b) What is hexamine ? How it is prpared? What is its use? 2
Or, (a) What happens when - 3
(i) Ethanal reacts with 2, 4 - DNP.
(ii) propanone reacts with Sn -Hg + HCl.
(b) Explain that Methanal does not give haloform reaction. 2
9. (a) How will you synthesize carboxylic acid from Grignard reagent ? 3
(b) Write down the difference between phenol and carboxylic acid. 2
Or, (a) What is reducing and non-reducing sugar? 2
(b) Why starch forms violet color in addition of iodine? 3
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