ANS:B - chloroform

Fluorine is not a constituent of chloroform. Chloroform is a compound composed of carbon, hydrogen, and chlorine atoms, with the chemical formula CHCl3. It does not contain any fluorine atoms. Here's a brief explanation of the other options:

• Freon: Freon refers to a group of chlorofluorocarbons (CFCs) or hydrochlorofluorocarbons (HCFCs) used as refrigerants and propellants. These compounds contain chlorine and/or hydrogen, but not fluorine.
• Teflon: Teflon is a brand name for polytetrafluoroethylene (PTFE), which is a type of polymer known for its non-stick properties. It consists of carbon and fluorine atoms bonded together.
• Fluorocarbons: Fluorocarbons are compounds that contain carbon and fluorine atoms, such as those found in refrigerants, propellants, and polymers like Teflon. They do contain fluorine as a constituent element.