Chloroform is largely used for

Production of freon

The correct answer is Option (1) → Production of freon

Chloroform (CHCl₃) is largely used as a starting material for the manufacture of Freons (especially Freon-22).

Other options are incorrect because:

• It is not used as an antiseptic (toxic)
• Not used as a propellant (Freons were used, not chloroform)
• Paint removers mainly use methylene chloride, not chloroform