Amoxicillin is a modern semi-synthetic modification of which of the following?

An antiseptic,Dettol,is a mixture of two compounds '$A$' and '$B$',where $A$ has $6$ $\pi$ electrons and $B$ has $2$ $\pi$ electrons. What is '$B$'?

Which of the following is/are barbiturates?

The safest and the most common alternative of sugar is

Which class of drugs is used in sleeping pills?

Bithionol is added to soaps to impart antiseptic properties. The number of $-OH$ and $-Cl$ groups in its structure are respectively