BOARD QUESTION PAPER : MARCH 2015

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1 Board Question Paper : March 2015 BARD QUESTIN PAPER : MARH 2015 Note: i. All questions are compulsory. Answers to the two sections are to be written in the same answer book. i Figures to the right hand side indicate full marks. Write balanced chemical equations and draw neat and labelled diagrams, wherever necessary. v. Use of logarithmic table is allowed. vi. Answer to every question must be started on a new page. SETIN II Q. 5. Select and write the most appropriate answer from the given alternatives for each sub-question: [7] i. Identify the product D in the following sequence of reactions: Alc.KH HBr Na H 3 H 2 H 2 l B D Ether (A) 2,2-dimethylbutane (B) 2,3-dimethylbutane () hexane (D) 2,4-dimethylpentane Which of the following complexes will give a white precipitate on treatment with a solution of barium nitrate? (A) [r(nh 3 ) 4 S 4 ]l (B) [o(nh 3 ) 4 l 2 ]N 2 () [r(nh 3 ) 4 l 2 ]S 4 (D) [rl 2 (H 2 ) 4 ]l i What is the geometry of chromate ion? (A) Tetrahedral (B) ctahedral () Trigonal planar (D) Linear Primary and secondary nitroalkanes containing -H atom show property of. (A) chain isomerism (B) tautomerism () optical isomerism (D) geometrical isomerism v. In phenol carbon atom attached to H group undergoes. (A) sp 3 hybridisation (B) sp hybridisation () sp 2 hybridisation (D) no hybridisation vi. v Identify the strongest acid amongst the following. (A) hloroacetic acid (B) Acetic acid () Trichloroacetic acid (D) Dichloroacetic acid Which of the following vitamins is water soluble? (A) A (B) D () E (D) B 499

2 Std. XII Sci.: Perfect hemistry II Q.6. Answer any SIX of the following : [12] i. Write a note on Friedel raft s acylation. i How is ethylamine prepared from methyl iodide? What are antibiotics? Give two examples. Explain, why are boiling points of carboxylic acids higher than corresponding alcohols. v. How are proteins classified on the basis of molecular shapes? vi. v What are interstitial compounds? Why do these compounds have higher melting points than corresponding pure metals? Write the structures and IUPA names of the following compounds: a. Adipic acid b. -methyl butyraldehyde vi Explain with examples, branched and linear polymers. Q.7. Answer any THREE of the following: [9] i. n the basis of valence bond theory explain the nature of bonding in [of 6 ] 3 ion. Write the IUPA name of [o(n 2 ) 3 (NH 3 ) 3 ]. i Define lanthanoid contraction. Explain its effects. Write mechanism of Aldol addition reaction. Define carbohydrates. What are reducing and non-reducing sugars? Q.8. Answer any NE of the following: [7] i. Write a note on Gabriel phthalimide synthesis. What are biodegradable polymers and non-biodegradable polymers? Write one example of each. Explain cationic detergents. How is carbolic acid prepared from the following compounds: a. Aniline b. hlorobenzene and steam at 698 K? Draw structure of DDT. Write its environmental effects. Mention two physical properties of carbolic acid. 500

3 Board Question Paper : ctober 2015 BARD QUESTIN PAPER : TBER 2015 Note: i. All questions are compulsory. Answers to the two sections are to be written in the same answer book. i Figure at the right hand side indicate full marks. Write balanced chemical equations and draw neat and labelled diagrams, wherever necessary. v. Use of logarithmic table is allowed. vi. Answer to every new question must be started on a new page. SETIN II Q.5. Select and write the most appropriate answer from the given alternatives for each sub-question: [7] i. Which among the following reducing agents is NT used to reduce acetaldehyde to ethyl alcohol? (A) Na-Hg and water (B) Zn-Hg and conc. Hl () H 2 -Raney Ni (D) LiAlH 4 /H + Acetaldehyde, when treated with which among the following reagents does NT undergo addition reaction? (A) Ammonia (B) Hydroxylamine () Ammoniacal silver nitrate (D) Semicarbazide i What is natural rubber? (A) is-1,4-polyisoprene (B) Neoprene () Trans-1,4-polyisoprene (D) Butyl rubber What is salvarsan? (A) An antiseptic (B) An antibiotic () An antifertility drug (D) An analgesic v. Which among the following vitamins is also known as riboflavin? (A) B 1 (B) B 2 () B 6 (D) B 12 vi. v The amine which reacts with nitrous acid to give yellow oily compound is. (A) ethylamine (B) isopropylamine () secondary butylamine (D) dimethylamine What is the molecular formula of chromyl chloride? (A) r 2 l 2 (B) rl 2 () rl 3 (D) r 2 l 2 Q.6. Answer any SIX of the following : [12] i. Identify A and B in the following reaction : HBr alc.kh H 3 H = H 2 A B Distinguish between lanthanoids and actinoids. 501

4 Std. XII Sci.: Perfect hemistry II i How are the following compounds prepared? a. Benzyl alcohol from benzyl chloride. b. Propan-1-ol from propanal What is the action of acetic anhydride on: a. ethylamine? b. diethylamine? v. What are monosaccharides? Draw ring structure of - D - (+) - glucopyranose. vi. v Explain the following terms: a. ationic detergents b. Tranquilizers What is Stephen reaction? vi Explain Sidgwick s electronic theory with suitable example. Q.7. Answer any THREE of the following : [9] i. What is the action of nitrous acid on: a. primary nitroalkane? b. secondary nitroalkane? c. tertiary nitroalkane? i What is peptide linkage? How is tripeptide formed? Write the reactions involved in the preparation of: a. Teflon b. rlon c. PV What is the position of iron (Z = 26) in periodic table? Explain why is Fe 3+ more stable than Fe 2+? Q.8. Answer any NE of the following: [7] i. Discuss the mechanism of alkaline hydrolysis of bromomethane. How is carbolic acid prepared from chlorobenzene? What is the action of bromine water on carbolic acid? Write chemical test to distinguish between carbolic acid and alcohol. Explain cationic complexes and anionic complexes of co-ordination compounds. Write the structure and IUPA names of isomeric aldehydes having molecular formula 5 H 10. Draw the structure of aspirin. 502

5 Board Question Paper : March 2016 BARD QUESTIN PAPER : MARH 2016 Note: i. All questions are compulsory. Answers of both the sections should be written in same answer book. i Draw well labelled diagrams and write balanced equations wherever necessary. Figures to the right indicate full marks. v. Use of logarithmic table is allowed. vi. Every new question must be started on a new page. SETIN II Q.5. Answer any SIX of the following: [12] i. Why is Sc 3+ colourless while Ti 3+ coloured? (Atomic number Sc = 21, Ti = 22) Illustrate with example, the difference between a double salt and a co-ordination compound. i How is chlorobenzene prepared from aniline? How is chlorobenzene converted into diphenyl? What is metamerism? Explain metamerism with suitable examples of ethers. v. What are ketones? How are ketones classified? vi. How are a. 1-nitropropane and b. 2-nitropropane prepared from suitable oxime? v Define antioxidants. Draw structure of BHT. vi What are carbohydrates? Write the reaction for the preparation of nylon-6. Q.6. Answer any THREE of the following: [9] i. What are f-block elements? Distinguish between lanthanoids and actinoids. Explain the terms a. ptical activity b. Ligand c. Interstitial compounds i Write the formula of Tetraminodichloroplatinum (IV) chloride. How is propene converted into 1-bromopropane and 2-bromopropane? What are broad-spectrum antibiotics? How are polythene and neoprene prepared? Q.7. Answer any NE of the following: [7] i. Explain the mechanism of esterification. Write the reactions involved in dehydration of 1, 2 and 3 alcohols. What are vitamins? Name any two diseases caused by deficiency of vitamin A. Write the structures of: a. nucleoside b. nucleotide How are 1-nitropropane, 2-nitropropane and 2-methyl-2-nitropropane are distinguished from each other using nitrous acid? 503

6 Std. XII Sci.: Perfect hemistry II Q.8. Select and write the most appropriate answers from the given alternatives: [7] i. The preparation of alkyl fluoride from alkyl chloride, in presence of metallic fluorides is known as. (A) Williamson s reaction (B) Finkelstein reaction () Swarts reaction (D) Wurtz reaction i Identify the weakest acidic compound amongst the following: (A) p-nitrophenol (B) p-hlorophenol () p-resol (D) p-aminophenol n acid hydrolysis, propane nitrile gives. (A) propanal (B) acetic acid () propionamide (D) propanoic acid Which of the following amines yield foul smelling product with haloform and alcoholic KH? (A) Ethylamine (B) Diethylamine () Triethylamine (D) Ethylmethylamine v. Which of the following is NT present in DNA? (A) Adenine (B) Guanine () Thymine (D) Uracil vi. v Amongst the following, identify a copolymer. (A) rlon (B) PV () PHBV (D) Teflon Phenelzine is used as an. (A) analgesic (B) antiseptic () antipyretic (D) antidepressant 504

7 Functional Groups of rganic ompounds No. lass of the compound Functional group i. Alkanes (Saturated) Representation of the class (General formula) Example R H H 3 H 3 Ethane i Alkenes (Unsaturated) Alkynes (Unsaturated) Alkyl halides X (Halide) v. Alkyl cyanides or nitriles N (yano or cyanide or nitrile) vi. Nitroalkanes N 2 (Nitro) v Alcohols H (Hydroxyl) vi Phenols H (Phenolic) R H = H R H 2 = H 2 R R R X R N Ethylene H H Acetylene H 3 Br Methyl bromide H 3 N Methyl cyanide or Acetonitrile R N 2 H 3 H 2 N 2 R H Ar H Nitroethane H 3 H Methyl alcohol 6 H 5 H Phenol or carbolic acid ix. Amines NH 2 (Amino) R NH 2 2 H 5 NH 2 Ethylamine x. Ethers R R H 3 H 3 Dimethyl ether (Ether group) H 3 2 H 5 Ethyl methyl ether xi. Aldehydes H R H H H (Formyl or aldehydic) Formaldehyde H 3 H x Ketones Acetaldehyde R R H 3 H 3 (Keto or oxo) Acetone xi arboxylic acids H R H H H (arboxyl group) Formic acid 505

8 Std. XII Sci.: Perfect hemistry II x Esters R R R H 3 2 H 5 xv. Amides (Ester group) NH 2 Ethyl acetate R NH 2 H 3 NH 2 (Amido group) Acetamide xvi. Acid anhydrides R R H 3 H 3 xv Acyl chlorides xvi Sulphonic acids (Anhydride group) l (Acyl chloride group) S 3 H (Sulphonic acid group) R l Acetic anhydride H 3 Acetyl chloride R S 3 H 2 H 5 S 3 H Ethane sulphonic acid l 506

9 NTES

10 NTES

AMINES. 3. Secondary When two hydrogen atoms are replaced by two alkyl or aryl groups.

AMINES. 3. Secondary When two hydrogen atoms are replaced by two alkyl or aryl groups. AMINES Amine may be regarded as derivative of ammonia formed by replacement of one or more hydrogen atoms by corresponding number of alkyl or aryl group CLASSIFICATION 1. Ammonia 2. Primary amine 3. Secondary