​Given below are various plant natural products and their basic structural unit:​

​List I: Natural products​	List II: ​Basic unit
​A. Phenolics​	​I. Five-carbon isoprene unit​
​B. Alkaloids​	​II. Glucose unit attached by O-β-D-glucosyl linkage​
​C. Terpenoids​	​III. Nitrogen containing​
​D. Cyanogenic glycoside​	​IV. Aromatic arene ring with OH group​

Which of the following options represents the correct match of natural product and the basic unit:

Correct option is D

Explanation-

A. Phenolics → IV. Aromatic arene ring with OH group
Phenolics are defined by the presence of a benzene ring bearing one or more hydroxyl (OH) groups.
Example: Flavonoids, tannins.

B. Alkaloids → III. Nitrogen containing
Alkaloids are nitrogen-containing compounds, often with complex ring structures. They are usually derived from amino acids.
Example: Morphine, quinine, nicotine.

C. Terpenoids → I. Five-carbon isoprene unit
Terpenoids (also called isoprenoids) are built from isoprene (C₅H₈) units. They can form mono-, di-, sesqui-, and poly-terpenes.

D. Cyanogenic glycoside → II. Glucose unit attached by O-β-D-glucosyl linkage
Cyanogenic glycosides consist of a sugar moiety (usually glucose) linked to a cyanohydrin group. The glucose is attached via O-β-D-glucosyl linkage.

Correct match:
A - IV, B - III, C - I, D - II → Option d