Which of the following is NOT commonly used as a disinfectant or antiseptic?

Ethyl acetate is not commonly used as a disinfectant or antiseptic. While it is a solvent that is sometimes used in laboratory settings and for various industrial purposes, its effectiveness as a disinfectant or antiseptic is not recognized.

In contrast, chlorhexidine, hydrogen peroxide, and alcohol are widely recognized for their antimicrobial properties and are regularly utilized in medical and public health contexts. Chlorhexidine is often used for skin disinfection before surgical procedures, hydrogen peroxide serves as a potent disinfectant for various surfaces and can act as an antiseptic for minor wounds, and alcohol is frequently employed for hand sanitization and disinfecting surfaces. Each of these substances has specific efficacy profiles for killing bacteria, viruses, and fungi, making them the standard choices for disinfection in various settings.