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

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1. Q2 All questions carry equal marks
2. Q3 Figures to the right indicates full marks
3. Q4 The use of log table/non-programmable calculator is allowed Answer any four of the following: A Explain the stereospecificity when but-2-ene undergoes epoxidation using a peracid 05 followed by acid hydrolysis B Explain the primary structure of proteins? Draw the structure of 05 C Explain the following with one example: 05 D Explain the stereospecificity of the addition reaction of bromine to but-2-ene. 05 E What are basic a- amino acids? Give one example. How is glycine prepared by 05 F Write the following reaction and discuss its stereochemistry. 05
4. Q2 Answer any four of the following: A What is Beckmann rearrangement? Explain its mechanism with a suitable example. 05 B a) Explain the mechanism of Michael addition reaction. 03
   • b) Write the application of pinacol-pinacolone rearrangement. 02 Explain Killiani-Fischer synthesis with suitable example. 03
   • b) Explain the action of the following reagents on D- Glucose: 02 Write the methylation reaction of -D- Fructopyranose. 03
   • b) Why sucrose does not show mutarotation? 02 E Convert open chain Fischer projection formulae into Haworth formulae: 05 F a) What is the action of excess of phenyl hydrazine on D-Fructose? 03
   • b) What are epimers and give one example? 02
5. Q3 Answer any four of the following: A How does one determine from IR spectrum? 05
   • i. Progress of the reaction
   • ii. Hydrogen bonding in the molecule B Predict the number of signals and the splitting pattern in PMR spectra of the following 05 C An organic compound has the molecular formula C4H Determine the index of its 05 hydrogen deficiency and deduce its structural formula from the following spectral data Also write the name of the compound? D An organic compound has the molecular formula CsH 1900. Determine the index of its 05 hydrogen deficiency and deduce its structural formula from the following spectral data Also write the name of the compound? 7.4 (5H, multiplet) E Explain the hydrolysis of nucleic acids and write the structure of purine bases 05 F Explain the secondary structure of RNA & DNA? 05
6. Q4 Answer any four of the following: A a) What are plastics? Explain the difference between thermoplastics and thermosetting 03
   • b) Give the preparation and application of polystyrene. 02 B a) Explain Rosenmund reduction with suitable example. 03
   • b) What is Lindlar’s catalyst? Explain its selectivity. 02 C_a) Give the preparation and uses of Nylon- 6. 03
   • b) Write the biomedical uses of synthetic polymer. 02 D_ How is Raney-Ni prepared? How is it used in the reduction of the following compounds? 05 E a) Distinguish between addition polymer and condensation polymer. 03
   • b) Write the structure of the polymer obtained by polymerisation of phenol and 02 F a) Complete the following reactions: 03 ii)
   • b) Write any two uses of m-CPBA in synthetic organic chemistry? 02
7. Q5 A_ State true or false ( Any Five ) 5 marks
   • a) Polypeptides are derived from two to nine molecules of amino acids
   • b) Zwitter ion is a dipolar ion
   • c) Glycine is an example of acidic amino acid
   • d) Stereochemically equivalent ligands are called homotopic ligands
   • e) The molecule of ethanal does not have a enantiotopic face
   • f) reaction both stereoisomers are equally formed
   • g) Enzymatic reduction of pyruvic acid is an example of enantiomeric excess
   • h) reaction proceeds with retention of configuration
8. Q5 Choose the correct option and rewrite the statement (Any Five) 5 marks
   • a) Conversion of aldohexose to aldopentose is method
   • b) number of stereoisomers are possible for a aldohexose
   • c) The sugar that yields only glucose on its hydrolysis is
   • d) When monosaccharides are treated with excess phenyl hydrazine they form
   • e) The reaction of a- haloketone with alkoxide to give ester is known as
   • f) The reaction of with acid ( is called Pinacol- Pinacolone
   • g) Wittig reagent is State True or False(Any five) 05
   • a) Magnetic anisotropy brings about shielding of aromatic protons
   • b) Intense absorption band around indicates the presence of hydroxyl
   • c) 3000-1000 region is known as fingerprint region
   • d) The type of radiation used in IR spectroscopy is microwaves
   • e) The aldehydic protons is found at 9-10 ppm in NMR
   • f) Adenine is a derivative of pyrimidine
   • h) Adenine and thymine are bonded by two hydrogen bonds Match the columns (Any five) 05
   • c) Addition polymer
   • vi) NBS f) Reduction of acid chloride to aldehyde

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