Identify the pair of drugs which act as tranquilizers.

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

Which of the following antihistamines contains a $-CN$ group?

Veronal,a barbiturate drug,is used as:

Which of the following is not an example of an antacid?

Among the following,which are narcotic analgesics?