What type of detergent is $Cetyl \ trimethyl \ ammonium \ chloride$?

Which of the following options is correctly matched?

List-$I$	List-$II$
$A$. Bithional	$P$. Analgesics
$B$. Morphine	$Q$. Tranquilizer
$C$. Nardil	$R$. Antihistamine
$D$. Terfenadine	$S$. Antiseptic

Which one of the following is used as an antihistamine?

Which of the following statements are correct?
$(i)$ Drugs that mimic natural messenger by switching on the receptor are called agonists.
$(ii)$ Shape of the receptor does not change after attachment of chemical messenger.
$(iii)$ $A$ cationic detergent is formed when stearic acid reacts with polyethylene glycol.
$(iv)$ Seldane is an antihistamine.

Paracetamol is an example of.

Which of the following molecules does not contain oxygen?