Discussion
Correctly match the following secondary metabolites in Group-I with their chemical classes in Group-II.
| Group-I | Group-II |
|---|---|
| (P) Codeine | (1) Flavones |
| (Q) Podophyllotoxin | (2) Alkaloids |
| (R) Resveratrol | (3) Lignans |
| (S) Linamarin | (4) Monoterpenes |
| (T) Limonene | (5) Cyanogenic glycosides |
| (6) Stilbenes |
Answer: D
The correct matching is P-2; Q-3; R-6; S-5; T-4.
- Codeine, from the opium poppy, is a nitrogen-containing benzylisoquinoline alkaloid (2).
- Podophyllotoxin, from Podophyllum, is an aryltetralin lignan, the parent of the anticancer drugs etoposide and teniposide (3).
- Resveratrol, found in grape skins, is a stilbene (6).
- Linamarin, in cassava and flax, is a cyanogenic glycoside that releases hydrogen cyanide when hydrolysed (5).
- Limonene, the citrus peel compound, is a C10 monoterpene (4).
The options that call codeine a flavone, podophyllotoxin a cyanogenic glycoside or resveratrol a cyanogenic glycoside each misclassify a well-known compound; flavones are not used at all in the correct match.
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