Description
ASSIGNMENT BOOKLET
M.Sc. in Chemistry Programme
(MSCCHEM)
SPECTROSCOPIC IDENTIFICATION OF ORGANIC COMPOUNDS
(Valid from July, 2025 to June, 2026)
Tutor Marked Assignment
Spectroscopic Identification of Organic Compounds
Course Code: MCHE-012
Assignment Code: MCHE-012/TMA/2025-26
Maximum Marks: 100
Note: Attempt all the questions. The marks for each question are indicated against it.
a) How does conjugation affect the electronic transitions in organic molecules? Explain showing its effect on absorption maxima with the help of an example.
b) Describe the effect of substituent on the UV spectra of carbonyl compounds with the help of examples.
a) Differentiate between the following compounds on the basis of UV spectra. Explain your answer.
b) Predict the expected UV and IR spectra of the following compound. Me OH O (5)
a) Predict the lmax values of the following and explain your answer.
b) Explain the basis of 1H NMR spectroscopy. Which of the atomic nucleus out of12C, 2H, 19F is not NMR active and which is NMR active? Explain you answer. (
a) Why is TMS used as a standard in NMR spectroscopy. Explain what do upfield and downfield signify in a NMR spectrum.
b) Explain the solvent effect in the simplication of complex spectra taking a suitable example.
Interpret the NMR spectra of the following compounds. Give the expecteddvalues and explain your answer.
a) Write the principle of 2D NMR. How is it different from ID NMR?
b) List the benefits and limitations of COSY technqiue
a) Describe the use of broadband decoupling and off resonance decoupling in 13C NMR spectroscopy.
b) Answer the following with respect to HMQC experiment.
i) its full form
ii) its role in NMR
iii) the type of nuclei involved iv) type of spectrum obtained
8 a) DifferentiatebetweenCOSYandandHETCORexperimentsin2DNMR
b) What is meant by a base peak and a molecular ion peak in mass spectrum? How is mass spectrometry used in finding out mass of a compound? Explain.
a) Describe different ionisation methods involved in mass spectrometry.
b) Describe the concept of cleavages taking benzylic clevages in mass spectrometry.
10 a) Explain McLafferty rearrangement with the help of a suitable example.
b) What kind of information is available from UV, IR, NMR and Mass spectra of an organic compound. Explain with the help of an example.
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