Which of the following compounds is used as a tranquilizer?

The use of chemicals for the treatment of diseases is called:

Substances used in bringing down the temperature in high fevers are called

Examples for bactericidal and bacteriostatic antibiotics,respectively,are

Some drugs bind to a site other than the active site of an enzyme. This site is known as:

Barbiturates are hypnotic agents. Veronal is a derivative of barbituric acid. It can be synthesized by the following sequence,then the structure of veronal $(P)$ is :
$CH_2(CO_2Et)_2$ $\xrightarrow[EtI]{EtO^-}$ $\xrightarrow[EtI]{EtO^-}$ $\xrightarrow{Urea}$ $(P)$