The harmful chemical present in tobacco is:

Which one of the following chemicals is responsible for the production of $HCl$ in the stomach leading to irritation and pain?

Given below are two statements:
Statement $I:$ Aspirin and Paracetamol belong to the class of narcotic analgesics.
Statement $II:$ Morphine and Heroin are non-narcotic analgesics.
In the light of the above statements,choose the correct answer from the options given below.

Explain the term,target molecules or drug targets as used in medicinal chemistry.

Which of the following is a narcotic analgesic?

Which one of the following is a non-narcotic analgesic?