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

Questions asked in this paper

• N.B. Please Check whether you have got the right question paper
• 2) Figures to the right indicate full marks

1. Q1 Answer any three of the following:
   • A) Explain the use of Pt as catalyst. Carry out the reduction of the following using Pt. 5
   • i) Olefins
   • ii) Nitriles
   • iii) Arenes
   • B) a) Describe Hantzsch synthesis of Pyridine. 3
   • b) Write the resonating structures for furan. 2
   • C) a) Electrophilic substitution in furan takes place at position 2 & 5. Explain. 3
   • b) Complete the following reactions. 2
   • D) a) Explain acidic behaviour of Pyrrole. 3
   • b) Complete the following reactions. 2
   • E) a) What is Lindlar’s catalyst? What is the action of Lindlar’s catalyst on 3
   • i) 4-Octyne
   • ii) Benzaldehyde
   • b) Explain Diel’s Alder reaction of furan. 2
   • F) Complete the following reactions. 5
2. Q2 Answer any three of the following:
   • A) a) Convert the Fischer projection formula to Haworth formulae. forms) 3
   • b) What is the action of the following reagents on D-glucose? 2
   • B) a) Convert the following Haworth structures to Fischer projection formulae. 3
   • b) How is D-fructose converted to its Osazone 2
   • C) a) Explain Killiani-fischer synthesis with suitable example. 3
   • b) What are epimeric sugars? Give a suitable example. 2
   • D) a) Give the open chain structure of D-Ribose, hence deduce the structure of 3
   • b) Maltose is reducing sugar. Explain 2
   • E) a) What are protiens? Explain the primary structure of protiens. 3
   • b) What are polypeptides? How is the peptide bond formed. 2
   • F) a) What are nucleic acids? What happens when they are completely hydrolysed 3 in the alkaline medium
   • b) Draw the structure of 2
   • i) Adenine
   • ii) Guanine
3. Q3 Answer any three of the following
   • A) An organic compound has molecular formula C,H,O. Determine its index of hydrogen 5 deficiency and deduce its structural formula from the following spectral data
   • 2.6 (1H) multiplet, 9.6 (1H) singlet
   • B) a) Explain chromophore-chromophore interaction with a suitable example. 3
   • b) Define 2
   • i) Hypsochromic shift
   • C) a) Explain the types of bending vibrations associated with bonds in a molecule. 3
   • b) State and explain the Selection rule in IR spectroscopy 2
   • D) a) State the number of signals and splitting pattern in PMR spectra of the following 3
   • i) Butane
   • ii) 1, 3- Dibromopropane
   • b) Explain the application of Deuterium exchange technique in PMR spectroscopy. 2
   • E) a) Explain the mass spectral fragmentation pattern of 2-methyl butane. 3
   • b) State and explain the Nitrogen rule in mass spectroscopy. 2
   • F) How will you distinguish between the following pairs of compounds using a 5
4. Q4 Answer any three of the following
   • A) How is the polymerisation of vinyl chloride carried out in the presence of a peroxide. 5 Write the relevant mechanism involved Give 2 uses of the polymer formed
   • B) a) Convert to camphor. 3
   • b) What are alkaloids? How do they occur in nature? 2
   • C) Give the preparation, two uses and two properties of 5
   • i) Nylon 6, 6
   • ii) Polyurethrane
   • D) a) Give the reactions for Hofmann’s exhaustive methylation and degradation 3
   • b) Draw the structure of Vitamin A,. Write two sources of Vitamin 2
   • E) a) List the biomedical uses of polymers. 3
   • b) Write the products of Ozonolysis of 2
   • F) a) Explain the following terms: 3
   • i) Thermoplastics
   • ii) Fillers
   • iii) Elastomers
   • b) Draw the structure of Thyroxine. What is its main function? 2
5. Q5 A) Choose the correct answers from the options given & rewrite the sentence. 4 marks
   • a) Alkenes undergoes in the presence of mCPBA
   • b) Wilkinson’s catalyst consists of the metal . (Cu, Rh, Al)
   • c) is a specific reagent for benzylic bromination
   • d) 2-Butyne on reduction with gives cis-2-butene
   • A) Complete the following reactions. 4
   • B) Match the columns: 4
   • a) Ribose i) Ketohexose
   • vi) Ketopentose
   • B) Fill in the blanks by choosing the correct option: 4
   • p) is an example of a Neutral Amino Acid (Alanine, Lysine, Arginine)
   • q) The proposed structure for is (Primary, secondary, tertiary)
   • r) Waxes are (Esters, Alcohols, Acids)
   • s) The glycosidic linkage in nucleosides is the linkage
   • C) Fill in the blanks by choosing the correct option: 4
   • a) 6 to transitions are observed between nm
   • b) A non-linear triatomic molecule has possible modes of vibration
   • c) Signal splitting in PMR spectra occurs due to effect
   • d) The molecular ion in mass spectroscopy isa
   • C) State whether the following statements are True or False. 4
   • p) Ethene absorbs at longer wavelength than 1,3-butadiene
   • q) Stretching vibrations occur at higher energy than bending vibrations
   • s) spectrum, the base peak need not necessarily be due to the molecular ion
   • D) Match the columns: 3
   • a) Testoterone i) Vitamin D
   • v) Natural rubber
   • D) State whether the following statements are True or False. 3
   • p) Bakelite is a linear polymer
   • r) Buna-S-Rubber is obtained by condensation polymerisation

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