TYBSc Chemistry Sem 6 Organic Chemistry Question Paper PDF 2026 - Mumbai University | munotes

Questions asked in this paper

• Please check whether you have got the right question paper
• 2. Figures to the right indicate full marks

1. Q3 Use of log table Non programmable calculator is allowed
2. Q1 A) Answer any three of the following. What is the use of in organic synthesis? What is the action of 5 marks
   • i) Acetaldehyde
   • ii) Acetone
   • iii) Cyclohexanone
   • B) a)Describe the Hantzsch synthesis for the preparation of pyridine 03
   • b) Write the resonating structures of furan. 02
   • C) a) Explain briefly the basicity of pyrrole. Why pyrrole is a weak base compared to piperidine? 03
   • b) what is the action of following reagents on Furan? 02
3. Q1 2) pyridine +SO3
   • D) a) ‘Electrophilic substitution reaction in furan takes place at position 2 and 5’ explain 03
   • b) Complete the following reactions. 02 ii)
   • E) a) Give the preparation of Raney Nickel .Explain in the reduction of 03
   • ii) Nitriles
   • b) Explain; ‘Vilsmier — Haack reaction’ of furan. 02
   • F) Complete the following reactions. 05
   • ii) ( \— CH2- + ?
   • iii) CH3 ?
   • Q.P. Code :04002
   • iv) ?
4. Q2 Answer any three of the following
   • A) Write appropriate reactions for : 05
   • a) Conversion of D-arabinose to D-mannose
   • b) Acetylation of
   • B) a) Convert the following Fischer projections to Haworth formula pyranose forms) 03
5. Q1 CHO
   • b) Write the reactions for oxidation of D-glucose using (1) bromine water (2) conc 02
   • C) a) Convert the following Fischer projections to Haworth formulae (B-furanose forms) 03
6. Q2 CHO
   • b) Write the reactions for fiormation of osazone from D-glucose in a stepwise manner 02
   • D) a) Write the reactions for complete methylation of B-D- fructopyranose in a stepwise manner 03
   • b) Draw chair conformations of and B forms of D-glucopyranose. 02
   • Q.P. Code :04002
   • E) Name the bases present in DNA molecule and discuss its double helical structure 05
   • F) a) What are polypeptides? How do they differ from proteins? Give the structure of Gly-Ala-Gly. 03
   • b) Explain the term iso-electric point with reference to - amino acids. 02
7. Q3 Answer any three of the following
   • A) What is an auxochrome? Give any two examples of auxochromes in organic molecules. With the help of a 05 suitable example, explain hoiw chromophore- auxochrome interactions bring about bathochromic shift of U.V
   • B) An organic compound has molecular formula C7Hs0. Determine the index of its hydrogen deficiency and 05 deduce its structural formula from the following spectral data. Also write name of the compound
   • C) a) Organic molecules having symmetrical structures produce very few i. r. absorption bands as compared to 03 those which have unsymmetric structures. Explain this with suitable examples
   • b) Explain with a suitable example how i. r. spectroscopy is used to follow the course of a chemical reaction. 02
   • D) a) Explain the mass spectral fragmentation pattern of butanone. 03
   • b) What is a molecular ion peak? Explain its importance. 02
   • E) a) State the number of signals and splitting pattern in pmr spectra of the following compounds. 03
   • ii) 2-chloropropane
   • b) Explain anisotropic deshielding of aldehydic proton. 02
   • F) An organic compound has molecular formula CsH7N. Determine the index of its hydrogen deficiency and 05 deduce its structural formula from the following data. Also write name of the compound
8. Q4 Answer any three of the following
   • A) a) What are Ziegler Natta catalysts? Explain their role in the stereospecific synthesis of polypropylene. 03
   • b) Identify. the monomers in the following polymers 2
   • ii) O H
   • B) a). Write the products of ozonolysis of 03
   • b). Explain special isoprene role in terpenoids write an example. 02
   • C) a) Give the preparation, properties and uses of Teflon. 03
   • b) What are biodegradable polymers? Give an example with structure. 02
   • D) a) How is &- pinene converted to camphor? 03
   • b) the classification of alkaloids on the basis of the heterocyclic ring system. 02
   • Q.P. Code :04002
   • E) a) Explain the following terms in Polymer chemistry. 03
   • b) Give the structures of : 02
   • i) ii) Vitamin A
   • F) a) What is condensation polymerization? Give the reaction involved in the preparation of 03 polyurethane. Mention its applications
   • b) Write the products of Hofmann exhaustive methylation and degradation of 02
9. Q5 A) Choose the right answer from the alternatives given below each and rewrite the completed statements 4 marks
   • a) Wilkinson’s catalyst consists of transition (Ruthenium, Rhodium, Rhenium)
   • b) Esters on reduction with give (secondary alcohol, primary alcohol, tertiary alcohol )
   • c) on reduction with NaBH, gives Benzyl amine (Benzaldehyde, Benzamide,Benzoylchloride )
   • d) is a reagent which causes epoxidation of olefinic double bonds.(SeO2, m-CPBA, NBS)
   • A) Complete the following reactions: 04
   • Q.P. Code :04002
   • B) File is the blanks by choosing the correct options 04
   • a) are hydrolyzable lipids
   • b) The base present in both RNA and DNA is
   • c) acid
   • d) The coiling and folding of a protein molecule describes its structure
   • B) Match the columns. 04
   • C) Fill the blanks with appropriate choice. 04
   • a) transitions require maximum amount of energy
   • b) Vibrations which bring about change in of a molecule.cause |.R. absorption
   • c) Spacing between peaks of a multiplet is called constant
   • d) Magnetic anisotropy brings about of aldehydic proton
   • C) State true or false If acompound.is transparent in the range 250-400.nm, it does not contain any unsaturated group. 04
   • q) Nujol is used as a mulling spectroscopy
   • r) signal of -OH proton normally appears as a doublet
   • s) Mass spectrometry involves interaction of electromagnetic radiation with the sample
   • D) Match the columns: 03
   • iv) Thermoset
   • v) Condensation polymer
   • D), State whether the following one true/ false. 03 All natural products are secondary metabolites
   • q) Citral is an acylic diterpenoid
   • r) Adrenaline hormone

Read from the scan above, so a character or two may differ. The scan is the original.