Which of the following is an antidiabetic drug?

Which of the following is a good example of a psychotherapeutic agent?

Phenacetin is used as:

Which of the following detergents is used as a germicide?

Which of the following compounds is not an antacid?

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 :
$CH_2(CO_2Et)_2$ $\xrightarrow[EtI]{EtO^-}$ $\xrightarrow[EtI]{EtO^-}$ $\xrightarrow{Urea}$ $(P)$