What common household disinfectants, derived from formaldehyde, have a very high pH and can be damaging to skin and eyes?

Phenolic disinfectants are derived from formaldehyde and exhibit a very high pH, which can indeed be damaging to the skin and eyes. These disinfectants are known for their effectiveness in killing a wide range of pathogens, including bacteria and fungi, making them popular in both household and professional cleaning products. However, due to their high pH, they can cause irritation or injury upon contact with the skin or eyes, necessitating careful handling and appropriate personal protective equipment when used.

The other options, while they have their own uses in disinfection, do not share the same properties of being derived from formaldehyde or having a very high pH. Alcohol-based disinfectants typically have a lower pH and are less damaging to skin and eyes, while chlorine disinfectants, although effective, do not fall under the category of formaldehyde derivatives. Hydrogen peroxide, while also a common disinfectant, is not derived from formaldehyde and has different properties and safety considerations.