Core Course IX ORGANIC CHEMISTRY III - SEMESTER VI MODEL QUESTION PAPER Time: 3 hrs Maximum Weightage: 27
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1 Core Course IX ORGANIC CHEMISTRY III - SEMESTER VI MODEL QUESTION PAPER Time: 3 hrs Maximum Weightage: 27 Section A (Answer ALL questions) Choose the correct answer: 1. i) Primary amines on reaction with nitrous acid give: A. Carboxylic acid B. Alcohol C. Nitro compound D. Aldehyde ii) Carbylamine reaction is used for the confirmation of: A. 2 o amine B. 3 o amine C. 1 o amine D. Quaternary ammonium salts iii) The specific rotation of glucose changes with time. This phenomenon is called: A. Isomerism B. epimerism C. tautomerism D. mutarotation iv) Denaturation of proteins causes to destroy its: A. 1 o structure B. 2 o structure C. 3 o structure D. none of these 2. i) Among the following which is the basic amino acid: A. Glycine B. Alanine C. Lysine D. Valine ii) Ketohexose found in fruits is: A. Lactose B. Fructose C. Glucose D. Galactose iii) Choose the correct molecular formula of nicotine: A. C 10 H 5 N 2 O 2 B. C 10 H 14 N 2 C. C 10 H 6 N D. C 10 H 12 NO iv) Name the molecular rearrangement taking place when cyclohexane oxime is converted into caprolactum: A. Beckmann B. Claisen C. Pinacol-pinacolone D. Hoffmann 3. i) Lactose on hydrolysis using dilute acids gives: A. Glucose and galactose B. Glucose and Fructose C. Galactose and fructose D. Sucrose and fructose 49
2 ii) A nucleotide contains: A. Base and Sugar B. Base and phosphate group C. Base sugar and phosphate group D. Sugar and phosphate group iii) A mixture of acetylene and HCN when passed through a red hot tube gives: A. benzene B. pyridine C. Cyclohexane D. Phenol iv) Urea on heating at 150 o C gives: A. CO 2 B. H 2 O C. NH 3 D. Biuret 4. i) A steroid nucleus consist of fused carbon rings of: A. 3 hexagon and 1 pentagon B. 1 hexagon and 3 pentagon C. 2 hexagon and 3 pentagon D. 2 hexagon and 2 pentagon ii) Example for a triphenyl methane dye is: A. Phenolphthalein B. Malachite green C. Alizarin D. Methyl organe iii) A is a compound containing active methylene group. Its molecular formula is C 6 H 10 O 3. Identify the compound: A. Cyanoacetic ester B. Acetoacetic ester C. Dimethyl malonate D. Acetic anhydride iv) Nitrobenzene on treatment with steam in the presence of Fe metal gives: A. Aniline B. Nitrosobenzene C. Nitrosoamine D. Phenol 5. i) Purine bases present in RNA are: A. Adenine, Uracil, Cytosine B. Adenine, Guanine, Cytosine C. Uracil, Guanine, Cytosine D. Adenine, Thymine, Guanine ii) A sex hormone which prevents the ovulation is: A. Progesterone B. Corticosterone C. Cortisone D. Testosterone iii) Which of the following pair of molecules undergo Diels-Alder reaction? A. ethene and propene B. 1,3-butadiene and ethene C. ethene and 1-butene D. 2-butene and 1-butene iv) Paracetamol is: A. Para hydroxy acetanilide B. Para hydroxy benzanilide C. Ortho hydroxy acetanilide D. Ortho hydroxy benzanilide 50 (Weightage: 1 x 5 = 5)
3 Section B: Short Answer (Answer any SIX Questions) 6. Explain the reaction. O heat OH 7. Glucose on treatment with Fehling s solution gives a red precipitate. Justify your observation. 8. Give any one method for the determination of the sequence of amino acids in a protein. 9. What is meant by phospholipids? Mention its biological functions. 10. Which will be more basic, pyridine or piperidine? Account. 11. Give the method of preparation of methyl orange. 12. What is chemical shift? 13. Differentiate paper and thin layer Chromatography (Weightage: 1 x 6 = 6) Section C: Short Essay (Answer any FOUR Questions) 14. Give a short account on microwave assisted reactions in water. 15. Complete the reaction sequence. Conc.HNO 3 Zn/HCl CH 3 COCl + Conc.HNO Benzene A B 3 H 2 O/H C D + E F + G Conc.H 2 SO 4 Conc.H 2 SO Explain the preparation of soap from fats and oils. 17. Describe Watson and Crick model of DNA. 18. Explain solid phase peptide synthesis? 19. How will you distinguish CH 3 COOC 2 H 5 from CH 3 CH 2 CH 2 COOH by IR Spectroscopy? (Weightage: 2 x 4 = 8) Section D: Long Essay (Answer any TWO Questions) 20. Explain the reduction product of nitrobenzene under different ph conditions? 21. Discuss Gabriel Phthalimide synthesis. How will you separate primary, secondary and tertiary amines using Hinsberg s reagent? 51
4 22. Explain Killiani-Fischer synthesis. 23. Give a detailed account on the classification of dyes. (Weightage: 4 x 2 = 8) 52
5 Core Course IX ORGANIC CHEMISTRY III - SEMESTER VI MODEL QUESTION PAPER Time: 3 hrs Maximum Weightage: 27 Section A (Answer ALL questions) Choose the correct answer: 1. i) The sunshine vitamin is: A. Vitamin C B. Vitamin A C. Vitamin D D. Vitamin K ii) Glucose is: A. Disaccharide B. Monosaccharide C. Trisaccharide D. Polysaccharide iii) The monomer of Nylon 6 is: A. Hexamethylene diamine B. Adipic acid C. Caprolactum D. Adipic acid and hexamethylene diamine iv) Bases common to DNA & RNA are: A. Adenine, Cytosine, Uracil B. Guanine, Adinine, Cytosine C. Guanine, Uracil, Thymine D. Adinine, Thymine, Guanine 2. i) Indole is a: A. 1 o amine B. 2 o amine C. 3 o amine D. Heterocyclic amine ii) Fat is a: A. Lipid B. Protein C. Amino acid D. Ether iii) Alizarin is a: A. Dye B. Acid C. Aldehyde D. Ketone iv) Which of the following compound forms Zwitter ion? A. Amine B. Amino acid C. Aldehyde D. ether 3. i) Diels-Alder Reaction is an example of: A. Electrocyclic reaction B. Cycloaddition reaction 53
6 C. Ene reaction D. Sigmatropic reaction ii) Aniline on Benzoylation gives: A. Phenyl acetate B. Phenyl Benzoate C. Phenyl methyl ether D. Benzanilide iii) Which of the following is a sex hormone? A. DNA B. Progesterone C. Cholesterol D. Guanidine iv) Which of the following enzymes brings about the hydrolysis of cane sugar to glucose and fructose? A. Invertase B. Maltase C. Zymase D. Diastase 4. i) The sequence in which amino acids are arranged in a protein refers to: A. 1 o structure B. 2 o structure C. 3 o structure D. quaternary structure ii) A water soluble vitamin is: A. Vitamin A B. Vitamin C C. Vitamin D D. Vitamin E iii) An example of an amino acid containing sulphur is: A. Cysteine B. Aspartic acid C. Lysine D. Tyrosine iv) An example of an alkaloid is: A. Urea B. Furan C. Indigo D. Piperine 5. i) A polysaccharide is: A. Glucose B. Cellulose C. Fructose D. Maltose ii) The simplest aldose is: A. Glyceraldehyde B. Glucose C. Fructose D. Cane sugar iii) Which of the following reaction will be more ecofriendly? A. Butadiene + Maleic anhydride B. Friedel Crafts alkylation C. Sulphonation of benzene D. Nitration of nitrobenzene iv) The oxime of p-hydroxy acetophenone gives paracetamol by A. Claisen rearrangement B. Pinacol-Pinacolone rearrangement C. Beckmann rearrangement D. Schmidt Rearrangement (Weightage: 1 x 5 = 5) 54
7 Section B: Short Answer (Answer any SIX Questions) 6. Compare the basic strength of aniline, ortho nitroaniline and N-methyl aniline. 7. Draw the structure of nicotine. 8. What do you mean by isoelectric point? 9. What is the significance of Rf factor? 10. Distinguish between Vat dyes and Mordant dyes. 11. Draw the structure of cellobiose? 12. Aniline is less basic compared to ethylamine. Why? 13. How will you distinguish 1,3 pentadiene and 1,4 pentadiene by UV Spectroscopy. (Weightage: 1 x 6 = 6) Section C: Short Essay (Answer any FOUR Questions) 14. Write a short note on mutarotation. 15. What are the reduction products of nitrobenzene under different media? 16. Explain green synthesis. 17. How will you convert fructose to Glucose? 18. Explain the various steps involved in the sequencing of peptides by Edman Method? 19. How will you differentiate acetone and propionaldehyde by NMR spectroscopy? (Weightage: 2 x 4 = 8) Section D: Essay (Answer any TWO Questions) 20.a. Explain diazo coupling reaction and its synthetic use. b. Explain the Basicity of Piperidine 21.a. How is ethyl acetoacetate prepared? How it is synthetically very useful compound? b. What are lipids? Outline their biological importance. 22.a. Explain the twelve principles of Green Chemistry with examples. b. Write a short note on Ultra sound assisted Green Synthesis. 23.a. Give the Fisher s proof to the structure of Glucose? b. Give the biological significance of quinine. (Weightage: 4 x 2 = 8) 55
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