Which of the following compounds is used as a refrigerant?

Some halogen-containing compounds are useful in daily life. Some compounds of this class are responsible for the exposure of flora and fauna to increasing amounts of $UV$ light,which causes significant destruction. Name the class of these halocompounds. In your opinion,what should be done to minimize the harmful effects of these compounds?

In the past,which of the following substances was commonly used as a solvent for dry cleaning of clothes?

State the uses of halogen-containing organic compounds.

$1, 2-$Dibromoethane is added to $..........$ to prevent the deposition of lead metal.

Which of the following is true about freons?