BSc Chemistry SEM V ATKT May 2018-19 ATKT CHEMISTRY ORGANIC CHEMISTRY Question Paper - Mumbai University | munotes

Questions asked in this paper

• 1. Please check whether you have received the right question paper

1. Q2 All questions are Compulsory
2. Q3 Figures to the right indicates full marks
3. Q4 Use of logtables/non-programmable calculator is permitted Answer any Four of the following
   • (A) a) What is NGP effect? What are its characteristics? 3
   • b) Distinguish between nucleophilicity and basicity 2
   • (B) a)Explain with mechanism the acid catalysed esterification of carboxylic acids 3
   • b) Complete the following reaction and name the reaction involved: 2
   • (C) a) Give the mechanism of Chugaev reaction 3
   • b) Explain electrocyclic reaction with a suitable example 2
   • (D) a) What are pericyclic reactions? How are they classified? 3
   • b) Complete the following and name the reaction: 2
   • (E) a)Explain fluoresecence and phosphorescence with the help of a neat and 3
   • b) Distinguish between photochemical and thermal reactions. 2
   • (F) a)Explain with mechanism the photoreduction of Benzophenone to Benzpinacol 3
   • b) Write the products of Norrish type | reaction of Acetone at 2
4. Q2 Answer any four of the following
   • (A) the stereochemistry of unsymmetrically substituted biphenyls using 5
   • (B) State whether the following compounds are optically active or optically 3 inactive.Justify your answer
   • b) Define alternating axis of symmetry with a suitable example 2
   • (C) Give the Skraup synthesis of Quinoline. Write the reaction of Quinoline with n- 5
   • (D) Convert Pyridine to Pyridine-N-oxide. Draw the resonating structures of Pyridine- 5 N-oxide. What is its action on 1) SO2Cl2 and 2)Conc.HNO3 at
   • (E) Complete the following reactions 5
   • (F) What are Agrochemicals? How are they classified? Write the synthesis of Indole- 5
5. Q3 Answer any four of the following
   • (A) Explain the following terms with suitable examples: 5
   • (B) Write the structure of the following compounds: 5
   • (C) 1.2g of salicylic acid on acetylation gave 1.4g of acetyl salicylic acid. Determine 5 the theoretical yield and percentage yield
   • (D) Design.a suitable synthesis of the following compounds: 5
   • (E) What is atom economy? Calculate the % atom economy in the following reaction 5 Explain the use of the following in green chemistry 5
6. Q4 ~ Answer any four of the following
   • (A). Give analytical evidence to prove the following: 5
   • b) Citral is aldehyde
   • (B) Explain the use of Hofmann’s exhaustive methylation and degradation in the 5 structural determination of alkaloids with an example
   • (C) the synthesis of : 5
   • a) Citral from methyl heptenone b) Adrenaline from catechol
   • (D) Discuss: 5
   • a) lsomerism in citral Harmful effects of nicotine
   • (E) What are chromophores? Explain chromophore-chromophore interaction in uv- 5 visible spectroscopy with suitable examples
   • (F) Explain the significance of basepeak in mass spectroscopy. Give the mass spectral 5 fragmentation of Butan-2-one
7. Q5 (A) Select the correct answer and fill in the blanks (any Five) 5 marks
   • c) of carbene into double bond is an example of reaction
   • d) Polar solvents increase rate of reaction of
   • i) cope elimination ii) chugaev _ iii) pyrolysis of acetates
   • f) The number of molecules reacted or formed per photon of light absorbed is
   • i) yield of the reaction ii) quantum efficiency quantum yield
   • g) Norrish Type II reaction of 2-Hexanone gives
   • h) Substances which initiate a photochemical reaction but itself does not undergo any change is called a
   • (B) State whether the following are True or False (any Five) 5
   • a) Cummulenes with odd no of double bonds and unsymmetrical substitutions at
   • b) Meso tartaric acid is optically inactive although it contains two asymmetric
   • c) Trans-1,3-Dimethyl cyclobutane is chiral
   • e) oil is used both internally and externally
   • f) organic insecticide
   • g) is a herbicide Cytokinins are Plant growth reguators which stimulate cell division
   • (C) Give the IUPAC name of any five of the following compounds: 5
   • (D) State whether the following are True or False (any Five) 5
   • a) transitions occur in the vacuum uv region
   • b) Amolecule of citral contains two olefinic double bonds
   • c) The molecular ion peak of p-Nitro aniline will appear at even mass number value
   • d) atoms in nicotine are secondary in nature
   • e) Butadiene absorbs at a longer wavelength than ethene
   • g) Adrenaline is a peptide hormone

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