BSc Sem V 2023 2024 Nov 2024 CHEMISTRY ORGANIC CHEMISTRY Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 Attempt ANY FOUR of the following:
   • A) Write short notes on the following:
2. Q1 Cheletropic reactions 3 marks
   • ii) Electrophilicity 2
   • B) Complete the following reaction and name the product. Explain the 5 mechanism of the reaction
   • C) Explain the following terms: 5
   • v) synartetic acceleration
   • D) Using suitable examples explain sigmatropic and group transfer reactions. 5
   • E) Distinguish between the following:
3. Q1 Fluorescence and Phosphorescence li) Singlet and Triplet state 2 3 marks
   • F) What is photosensitisation? Explain the photochemical reduction of 5
4. Q2 Attempt ANY FOUR of the following:
   • A) a) State whether following compounds are optically active or optically 3 inactive. Justify your answer
   • i) ii) 2
   • b) Define centre of symmetry with an example
   • B) Write a note on stereochemistry of allenes. 5
   • C) a) Give synthesis of indole-3-acetic acid. 3
   • b) Give preparation of pyridine-N-oxide from pyridine. 2
   • D) Complete the following reactions. 5
   • E) What are Agrochemicals? Give advantages of using agrochemicals. Write the synthesis of Endosufan
   • F) Give the Bischler-Napieralski synthesis for the preparation of Isoquinoline Write the reaction of isoquinoline with alkaline KMnO,
5. Q3 Attempt ANY FOUR of the following:
   • A) Give the IUPAC names of the following: 5
   • B) Write the structural formula for each of the following compounds: 5
   • C) a) Explain convergent synthesis with a suitable reaction? 3
   • b) Define chemoselectivity with a suitable example? 2
   • D) a) Explain multicomponent synthesis with a suitable example? 3
   • b) What is E-factor? Give its significance? 2
   • E) Give the synthesis of the following from a suitable starting compound. 5
   • F) Define atom economy? Calculate the percentage atom economy of the 3
   • b) Give any two applications of biocatalyst in green chemistry? 2
6. Q4 Attempt ANY FOUR of the following:
   • A) a) Explain the following terms used in spectroscopy with suitable example 3
7. Q1 Chromophore Auxochrome
   • b) the shifts in absorption bands in UV- visible spectroscopy. 2
   • B) Explain the fragmentation of the 2- Methyl pentane 3
   • b) Define Base peak and Isotopic peak 2
   • C) a) terpenoids? Give products of ozonolysis of the following terpenoid? 3
   • b) Special isoprene rule with suitable example. 2
   • D) Give the reaction for Hofmann exhaustive methylation and degradation of 3
   • b) What are harmful effects of nicotine? 2
   • E) a) Give the synthesis of citral from 6- methyl hept-5-en-2-one. 3
   • b) Give analytical evidence that nicotine has pyridine ring with a side chain 2
   • F) a) Give Ott’s synthesis of adrenaline? 3
   • b) Give any one analytical evidence to prove that citral is an a, B- unsaturated 2
8. Q5 A) Select the correct option and complete the following statements: (ANY 5 marks
   • a) Base catalysed hydrolysis of esters is called
   • b) Nucleophilicity term
   • c) Transition state is a. characterised by partial bonds
   • d) NGP assisted nucleophilic substitution reactions show .in rate of reaction with . of configuration
   • f) Transfer of radiant energy from donor to acceptor molecule is called
   • g) . is an allowed electronic transition
   • h) Photochemical cleavage of carbonyl compounds to form alkane and carbon monoxide are called . reactions
9. Q1 Norrish Type I
   • B) State whether the following statements are TRUE or FALSE: (ANY 5
   • a) Trans-1,3-Dimethyl cyclobutane is chiral
   • b) Cumulenes having odd number of double bonds shows geometrical
   • c) Alternating axis of symmetry is also known as rotation reflection axis
   • d) Electrophilic substitution reactions on isoquinoline takes place preferably at
   • e) Isoquinoline is also known as 2-azanaphthalene
   • f) Gibberelins belong to the class of Plant Growth Regulators
   • g) Endosulfan is a plant growth regulating hormone
10. Q5 C) Fill in the blanks with correct alternatives given in the bracket : (ANY 5 marks
    • a) Addition of halogen acid to an unsymmetrical alkene is an example of
    • b) Methane is an example of ----------- raw material
    • c) ------- causes selective methylation of active methylene compounds
    • d) Oxidation of aldehydes can be carried out with benign reagents like
    • e) Dry cleaning of the clothes can be done using ------- instead of carbon
    • f) benzo[c]pyridine is also called
    • g) For the nomenclature of spirans the -------- ring is given preference
    • h) the fused and the bridged ring systems the numbering starts from one of the --------- carbon atoms
    • D) Match the columns: (ANY FIVE) 5
    • b) (ii) Nicotine
    • d) Pinner (iv)
    • e) Odd number of nitrogen atom (v) Laevorotatory
    • f) (vi) Neral

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