2nd Year Chemistry Chapter 7 Test07. Organic Chemistry

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. (+)-Ibuprofen is:
   1. Inactive
   2. Active
   3. Toxic
   4. Neutral
2. Geometric isomerism is shown by
   1. alkenes
   2. alkynes
   3. alkanes
   4. lkanes
3. Which one is the least stable compound?
   1. cis-but-2-ene
   2. rans-but-2-ene
   3. trans-hex-3-ene
   4. rans-pent-2-ene
4. Asymmetric synthesis of (+)-thalidomide involves:
   1. Ordinary hydrogenation
   2. Use of chiral catalysts
   3. Free radical reactions
   4. Chain reactions
5. The role of chiral catalyst in asymmetric synthesis is to:
   1. Stop hydrogenation
   2. Increase molecular weight
   3. Remove impurities
   4. Favor production of one enantiomer
6. The (−)-enantiomer of thalidomide is:
   1. Sedative
   2. Harmless
   3. Teratogenic
   4. Pain reliever
7. The (+)-enantiomer of thalidomide acts as:
   1. Teratogenic
   2. Sedative
   3. Analgesic
   4. Antipyretic
8. A mixture containing equal amounts of two enantiomers is called:
   1. Isotonic mixture
   2. Geometric mixture
   3. Racemic mixture
   4. None
9. Which isomerism is used to explain taste difference in amino acids?
   1. Chain isomerism
   2. Optical isomerism
   3. Geometric isomerism
   4. Structural isomerism
10. Why is administration of a single enantiomer of thalidomide ineffective?
    1. They decompose quickly
    2. They interconvert in the body
    3. They are unstable in air
    4. They do not dissolve