**Question:** Following are true regarding chlorination except ?

A. Chlorination is a process of adding chlorine atoms to a molecule
B. Chlorination is the process of adding chlorine atoms to a molecule
C. Chlorination is a process that leads to the production of carcinogenic compounds
D. Chlorination is a process that always results in the formation of free radicals

**Core Concept:**
Chlorination is a chemical reaction in which chlorine atoms are added to a molecule. Chlorine is a halogen element that forms compounds with higher electronegativity than the element being chlorinated. Chlorine is commonly used as a disinfectant due to its effectiveness against microorganisms.

**Why the Correct Answer is Right:**
The correct answer, option B, is right because chlorination involves the addition of chlorine atoms to a molecule. This is a key feature of the process, as it results in the formation of new compounds containing chlorine atoms.

**Why Each Wrong Option is Incorrect:**
A. This option is incorrect because chlorination is a process where chlorine atoms are added to a molecule, not removing them.
C. Although chlorination can lead to the production of carcinogenic compounds, not all chlorinated compounds are carcinogenic. The incorrect statement claims that chlorination always results in the formation of carcinogenic compounds, which is not accurate.
D. The correct answer shows that chlorination involves the addition of chlorine atoms to a molecule, not the formation of free radicals. Free radicals are formed during some chemical reactions involving chlorine, but not all chlorination reactions result in free radical formation.

**Clinical Pearl:**
Understanding the correct and incorrect statements about chlorination is essential for medical professionals, especially pharmacologists and toxicologists. Chlorination can have diverse effects on molecules, including antimicrobial properties, but it is essential to be aware of potential adverse effects, such as the production of carcinogenic compounds and free radical formation in some cases.

**Correct Answer:** B. Chlorination involves the addition of chlorine atoms to a molecule.