Which statement about aldehydes is true?

Which statement about aldehydes is true?

• A. They are non-toxic and safe for all uses
• B. They are not used as disinfectants
• C. They are safe to inhale without PPE
• D. They are disinfectants that are volatile, toxic, and kill most organisms except prions

Answer: (D)

Aldehydes act as powerful disinfectants and sterilants, but they come with significant hazards. Substances like formaldehyde and glutaraldehyde release fumes that are toxic, so handling them requires proper ventilation and protective equipment. They are effective against a wide range of microorganisms, including bacteria, viruses, fungi, and many spores with appropriate contact times. However, prions are notoriously resistant to standard disinfectants, including aldehydes, so these chemicals do not reliably inactivate prions. That combination—strong antimicrobial activity plus inhalation risk and the inability to reliably neutralize prions—makes the statement true. The other options are false because aldehydes are not non-toxic or safe for all uses, they are indeed used as disinfectants, and inhaling their fumes without protection is dangerous.

Aldehydes act as powerful disinfectants and sterilants, but they come with significant hazards. Substances like formaldehyde and glutaraldehyde release fumes that are toxic, so handling them requires proper ventilation and protective equipment. They are effective against a wide range of microorganisms, including bacteria, viruses, fungi, and many spores with appropriate contact times. However, prions are notoriously resistant to standard disinfectants, including aldehydes, so these chemicals do not reliably inactivate prions. That combination—strong antimicrobial activity plus inhalation risk and the inability to reliably neutralize prions—makes the statement true.

The other options are false because aldehydes are not non-toxic or safe for all uses, they are indeed used as disinfectants, and inhaling their fumes without protection is dangerous.