Which among the following is not used as a chemical antiseptic and disinfectant?

UPPSC-2021

Applied Microbiology & Infection control

Easy

Appeared in: UPPSC-2021

Explanation

Benzene hexachloride, also known as Lindane or BHC, is classified as an organochlorine insecticide and ectoparasiticide.
Its primary medical use is for the treatment of parasitic infestations such as scabies and pediculosis (lice).
It is not used as an antiseptic or disinfectant because it is a potent neurotoxin with significant side effects and has a different mechanism of action compared to germicides.
Its use is restricted, especially in children and pregnant women, due to the risk of systemic absorption and central nervous system toxicity.

Option A: Formaldehyde is a well-known high-level disinfectant and sterilant. It is widely used for fumigating operation theatres and wards, and for preserving anatomical specimens.
Option B: Phenol (carbolic acid) is a classic disinfectant used as a standard to compare the potency of other disinfectants (Phenol Coefficient). It is effective for disinfecting surfaces, excreta, and contaminated equipment.
Option C: Hydrogen peroxide is a versatile oxidizing agent. In low concentrations (e.g., 3%), it is used as a mild antiseptic for cleaning wounds. In higher concentrations, it serves as a high-level disinfectant for instruments and surfaces.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification and application of chemical agents (antiseptics, disinfectants, and insecticides) as background academic context rather than a clinical decision trigger.
A nurse must understand the correct application of chemical agents to ensure patient safety and prevent harm. Using an insecticide like Benzene hexachloride on a wound would be highly toxic and dangerous.
Selection of the appropriate antiseptic or disinfectant depends on the object to be treated (living tissue vs. inanimate surface) and the type of microorganism to be eliminated.
What if? If a patient has a seizure disorder, Benzene hexachloride (Lindane) is strictly contraindicated even for treating scabies, as it can lower the seizure threshold. Safer alternatives like permethrin would be the first-line treatment.

How to Approach the Question

First, identify the negative framing of the question with the word 'not'. This means you are looking for the option that does not fit the described category.
The question asks which chemical is NOT an antiseptic or disinfectant.
Review each option and recall its primary use in a clinical or public health setting.
Formaldehyde is used for fumigation (disinfection).
Phenol is a classic disinfectant for surfaces.
Hydrogen peroxide is a common wound antiseptic.

Concept Tested & Keywords

Concept Tested: Classification and application of chemical agents (antiseptics, disinfectants, and insecticides).
Stem keywords: chemical antiseptic, disinfectant
Lead-in keywords: not used as
Negative lead-in flag: Question asks which option is NOT used for a specific purpose.

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