Discussion
Match the secondary metabolites in Group-I with types of secondary metabolites in Group-II in CORRECT order.
| Group-I | Group-II |
|---|---|
| P. Myrcene | I. Sesquiterpene |
| Q. β-Farnesene | II. Cyanogenic glycoside |
| R. Amygdalin | III. Flavone |
| S. Nicotine | IV. Alkaloid |
| T. Luteolin | V. Monoterpene |
Answer: D
The correct order is P-V, Q-I, R-II, S-IV, T-III.
- Myrcene is a C10 acyclic monoterpene, made of two isoprene units (V).
- β-Farnesene is a C15 sesquiterpene, three isoprene units, known as an aphid alarm pheromone (I).
- Amygdalin, from bitter almond and apricot kernels, is a cyanogenic glycoside that releases HCN on hydrolysis (II).
- Nicotine, from tobacco, is a pyridine alkaloid (IV).
- Luteolin is a flavone (III).
Option A swaps the two terpenes, and options B and C misplace amygdalin and nicotine as well.
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