What is Freon-$12$?

Which among the following is used as a fumigant pesticide for strawberries?

Freon (dichlorodifluoromethane) is used:

State the uses and harmful effects (side effects) of dichloromethane (methylene dichloride),$CH_2Cl_2$.

Which one of the following groups of compounds acts as an extinguisher,antiseptic,insecticide,and anesthetic,respectively?

State the various uses of:
$(i)$ Dichloromethane (Methylene chloride)
$(ii)$ Trichloromethane (Chloroform)
$(iii)$ Tri-iodomethane (Iodoform)
$(iv)$ Tetrachloromethane (Carbon tetrachloride)
$(v)$ Freons