INSTRUMENTAL METHODS OF ANALYSIS-II — DU B.Sc. (Prog.) Applied Physical Science with Analytical Methods in Chemistry & Biochemistry Previous Year Question Papers

a respect uner orient and sping pates multiplicity observed in the H 2. Elucidate the structure of the following compounds using the given 'H NMR data. (a) A compound with molecular formula: C1oH14 and 'H NMR (400 MHz, CDCl): 8 7.20- (b) A compound with molecular formula CsHsO and 'H NMR (400 MHz, CDCI): 8 9.80 (c) A ketone with molecular formula C5Hioo and ]H RAffi (400 MEL, CDC13): 8 2.41 (t, 3. (a) Sketch a comprehensively labeled schematic diagram of a Nuclear Magnetic Resonance quMR) speetrometer. Outline the specific operational function of each major component. (b) Describe the effect of electronegativity on chemical shift in ]H NMR with suhable ermples. a) Discuss the inporiance of internal and external reference compounds in rum spectroscopy. 4. (a) Explain the differences between atomic absorption spectroscopy and photoelectron spectroscopy. a) Outline the key postulates Of Bohr's atomic model as applied to the hydrogen atom. (c) What is the role of an atomizer in atomic spectroscopy techniques? Give examples. 5. Write detailed explanatory notes on the following: (a) Spin-spin coupling jn t H NMR spectroscopy a Atomic Emission Spectroscopy (AES) 6. Explain the ESR (Electron Spin Resonance) spectra of the following radicals with appropriate diagram. (a) Methyl radical (CH3.) a) Cyclopentadienyl radical (C5H5.JS (c) Ethyl radical (cH3cH2.}