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FOURTH SEMESTER (CBCSS—UG) DEGREE EXAMINATION
APRIL 2023
Chemistry

CHE 4B 04—ORGANIC CHEMISTRY—I
(2019 Admission onwards)
Time : Two Hours Maximum : 60 Marks

Section A (Short answers)

Answer questions up to 20 marks.

Each question carries 2 marks.
1. Name two groups with + 1 effect and — 1 effect.
2. What are free radicals ? How are they formed ?
3. Which is more stable but-1-ene or but-2-ene ? Why ?
4. Distinguish between enantiomers and diastereomers.
5. Draw the chair and boat forms of cyclohexane and indicate the axial and equatorial bonds.
6. Represent the E and Z isomers of 1-bromo-1-chloropropene.
7. Discuss any two tests for identifying unsaturation in organic compounds.

8. An alkene on ozonolysis gave only acetone as the product. Identify the alkene and write the

equation for ozonolysis reaction.
9. What is the major product of dehydration of butanol-1 ? Explain.
10. State and explain Huckel’s rule.
11. Which is more basic - pyrrole or pyridine ? Justify.
12. What are anti aromatic compounds ? Give two examples.

(Ceiling of marks : 20)

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