Organic chemistry

1. TDMNS College, T. Kallikulam
Department of M.Sc. Chemistry
III-Internal Test- November-2022
II-M.Sc Chemistry ZCHM 31- Organic Chemistry-III
Maximum Marks: 20 Time: 1 hour
Part A (2x1= 2 marks)
1. Define nitrogen rule in Mass spectra.
2. Write the Demjanov reaction (no mechanism).
Part B (5x2 = 10 marks)
3. (a) Write the short note on Von – Richter and Sommelet-Hauser
rearrangement.
Or
(b) Define the term Base peak, Molecular ion peak, Metastable
ions, Isotopic peak, and daughter ions with example.
4. (a) Write the rules for fragmentation pattern in Mass spectra of
alcohols, aldehyde, acids, phenols, and nitro compounds,
Or
(b) Discuss in short on the Mc–Lafferty rearrangement and give
the mass fragmentation pattern of acyclic compounds, ethers, and
ketones.
Part C (1 x 8 = 8 marks)
5. (a) Elaborate the Carbon to Nitrogen migration reaction with
mechanism.
Or
(b) Explain the following with mechanism
(i) Pinacol – Pinacolone,
(ii) Arndt – Eistert synthesis
Good Luck
TDMNS College, T. Kallikulam
Department of M.Sc. Chemistry
III-Internal Test- November-2022
II-M.Sc Chemistry ZCHM 31- Organic Chemistry-III
Maximum Marks: 20 Time: 1 hour
Part A (2x1= 2 marks)
1. Define nitrogen rule in Mass spectra.
2. Write the Demjanov reaction (no mechanism).
Part B (5x2 = 10 marks)
3. (a) Write the short note on Von – Richter and Sommelet-Hauser
rearrangement.
Or
(b) Define the term Base peak, Molecular ion peak, Metastable
ions, Isotopic peak, and daughter ions with example.
4. (a) Write the rules for fragmentation pattern in Mass spectra of
alcohols, aldehyde, acids, phenols, and nitro compounds,
Or
(b) Discuss in short on the Mc–Lafferty rearrangement and give the
mass fragmentation pattern of acyclic compounds, ethers, and
ketones.
Part C (1 x 8 = 8 marks)
5. (a) Elaborate the Carbon to Nitrogen migration reaction with
mechanism.
Or
(b) Explain the following with mechanism
(i) Pinacol – Pinacolone,
(ii) Arndt – Eistert synthesis
Good Luck