Question

Match column I with column II.

Columns I	Columns II
A) Carbon tetrachloride	i. Paint remover
B) Methylene chloride	ii. Refrigerators and air conditioners
C)DDT	iii. Fire extinguisher
D) Freons	iv. Non-biodegradable insecticide

A)\[\text{A=}\left( \text{ii} \right)\text{, }\left( \text{B} \right)\text{=}\left( \text{iii} \right)\text{, }\left( \text{C} \right)\text{=}\left( \text{i} \right)\text{, }\left( \text{D} \right)\text{=}\left( \text{iv} \right)\]
B)\[\text{A=}\left( \text{i} \right)\text{, }\left( \text{B} \right)\text{=}\left( \text{ii} \right)\text{, }\left( \text{C} \right)\text{=}\left( \text{iii} \right)\text{, }\left( \text{D} \right)\text{=}\left( \text{iv} \right)\]
C)\[\text{A=}\left( \text{iv} \right)\text{, }\left( \text{B} \right)\text{=}\left( \text{iii} \right)\text{, }\left( \text{C} \right)\text{=}\left( \text{ii} \right)\text{, }\left( \text{D} \right)\text{=}\left( \text{i} \right)\]
D)\[\text{A=}\left( \text{iii} \right)\text{, }\left( \text{B} \right)\text{=}\left( \text{i} \right)\text{, }\left( \text{C} \right)\text{=}\left( \text{iv} \right)\text{, }\left( \text{D} \right)\text{=}\left( \text{ii} \right)\]

Answer 1

Hint: The carbon tetrachloride is non-inflammable and thus it controls the class A “free burning” fire. The methylene chloride is used as a solvent and it is volatile and can dissolve and remove the paint. The DDT is an insecticide but cannot be decomposed by the microbes. Freons are the highly volatile CFCs used in sprays, aerosols, etc.

Complete answer:
A) \[\text{CC}{{\text{l}}_{\text{4}}}\] Is an organic compound. It is tetrahedral in structure. Carbon chloride is a clear and colourless compound. It has a boiling point of ${{77}^{0}}C$ and turns solid at$-{{25}^{0}}C$. It is slightly heavier than the water.it is used as the raw material for various purposes.it is widely used as the fire extinguisher. Due to its low boiling point, it is a volatile compound.
Carbon tetrachloride is used to extinguish class A which is a “free burning” type of fire.$\text{CC}{{\text{l}}_{\text{4}}}$ When burned it does not undergo the combustion as the hydrocarbon. Thus it does not combust. In other words, it is incombustible. Its incombustible vapours are denser than air which leads to soothe the flame.
Therefore, $\text{CC}{{\text{l}}_{\text{4}}}$ act as a fire extinguisher.
B) Methylene dichloride is a chlorinated hydrocarbon. This is used as an inhalation anaesthetic and acts as a narcotic in higher concentrations. It is a volatile organic compound. It can act as a solvent. It is used for the removal of organic compounds. Since paints are organic dyes, methylene dichloride is useful as a paint remover.

 C) Dichlorodiphenyltrichloroethane is abbreviated as the DDT. It is a colourless, tasteless, and odourless chemical compound.
DDT is a synthetic pesticide used by the Friedel craft reaction. DDT is an organic pollutant that readily absorbs into the soil.it acts as the sink and its exposure affects the organism. It is widely used as an insecticide. A substance is said to be biodegradable if the microorganism can decompose it. However, the DDT cannot be decomposed by the microorganism. This is because no such enzyme is found in the microbe which can degrade the DDT.
Therefore, DDT is a non-biodegradable insecticide.
D) Freons are simple highly fluorinated aliphatic compounds. This has commercial use .In addition to the fluorine it also contains hydrogen, chlorine, or bromine in the molecular formula. The freons are a type of Chlorofluorocarbons $\text{(CFCs)}$ , hydrochlorofluorocarbons \[\left( \text{HCFCs} \right)\]. Freons are non-flammable, non-corrosive, odourless gases or liquids. They have low boiling points and are useful in refrigerators. They are also the major component of aerosols propellants.
Hence,

Columns I	Columns II
A) Carbon tetrachloride	iii. Fire extinguisher
B) Methylene chloride	i. Paint remover
C)DDT	iv. Non-biodegradable insecticide
D) Freons	ii. Refrigerators and air conditioners

Correct option is (D).

Note:
This all are harmful organic compounds. They have very fatal effects on humans as well envornment.In solving such questions always remember the example and effect of organic compounds.