Q1

a)C5H9N3

c) Amine functional group will form hydrogen bomb. with water molecules to make it water soluble.

Q2)
a) C16H21N3
b) They have in common a substituted ethylamine moiety (-CH2-CH2-N-) as an integral part of their molecule

Q3) Drugs that give physiological response in the body
-aspirin
-esterogen
-morphine
-ampethamine

Drugs that inhibits the growth of substances that cause infection
-penicillin
-(keflex) antibiotic

Q4)
a) All drugs are regulated in the US by the FDA. Herbal/traditional/chinese medicines are treated like supplements than drugs. As such, they’re not placed under the same tight and strict regulations medicines and drugs have to go through. This is why such supplement/traditional medicines do not need to go through clinical trials.

b) Health supplements like those are not subjected to approvals prior to import and sale in Singapore.