Which of the following chemicals can be used as dry cleaning agents?
a) $Cl_2C=CCl_2$
b) $CO_2$ (liq)
c) $H_2O_2$
d) $CH_3CHO$

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?

Freons are used in ...... .

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

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

Chloral $+$ Chlorobenzene $\xrightarrow{\text{Conc. } H_2SO_4}$ product.
The product is :