Texas Esthetician License Practice Exam

What statement about phenolic disinfectants is true?

1. They are non-toxic

2. They are a form of alcohol

3. They are a form of formaldehyde

4. They can only be used in high concentrations

The correct answer is: They are a form of formaldehyde

Phenolic disinfectants are indeed a form of formaldehyde, which is a true statement. Phenol and its derivatives, known as phenolic disinfectants, have a strong antimicrobial action and are used for their ability to eliminate a wide range of pathogens. These compounds are derived from coal tar and are recognized for their efficacy in disinfection and antisepsis. Formaldehyde, a colorless gas with a pungent odor, is an organic compound that serves as a precursor to phenolic compounds. While phenolic disinfectants can be harmful with prolonged exposure, they are especially valued in medical and laboratory settings for their powerful germicidal properties. In contrast to this accurate representation, the other options do not correctly describe phenolic disinfectants. They are not non-toxic and can cause skin irritation and other health issues upon contact. They are not a form of alcohol; instead, alcohols are a distinctly different class of disinfectants. Additionally, while phenolic disinfectants can be effective in varying concentrations, their use at very high concentrations isn't the standard practice required for effective disinfection, which is typically achieved at lower concentrations.