Question

Find out all the functional groups present in the following polyfunctional compounds :

a. Dopamine a neurotransmitter that is deficient in Parkinson’s disease.

b. Thyroxine the principal thyroid hormone.

c. Penicillin G, a naturally occurring antibiotic

Answer 1

i. Functional groups :

Phenolic -OH group (Ar-OH) and primary amine (-NH₂) group are present in dopamine.

ii. Functional groups : 

Phenolic -OH group (Ar-OH), halide (-I), ether (Ar-O-Ar), primary amine (-NH) carboxylic acid (-COOH) groups are present in thyroxine.

iii. Functional groups : 

Secondary amide

Carboxylic acid (-COOH), tertiary amide

thioether (R-S-R) groups are present in penicillin G.