Benzalkonium chloride is a

cationic surfactant and antiseptic

The correct answer is 1. Benzalkonium chloride is a cationic surfactant and antiseptic. It is a quaternary ammonium compound that has a positively charged head and a negatively charged tail. This allows it to interact with the negatively charged cell membranes of bacteria and viruses, disrupting their structure and killing them. Benzalkonium chloride is also soluble in water and most organic solvents. It is used in a variety of products, including antiseptics, disinfectants, and cosmetics.

Benzalkonium chloride is not an anionic surfactant, nor is it insoluble in most organic solvents. It is also not an antimalarial.

Here is a table that summarizes the properties of benzalkonium chloride: