Question

\[CC{{l}_{4}}\] is used as fire extinguisher because:
a.) Its melting point is high
b.) It forms covalent bond
c.) Its boiling point is low
d.) It gives incombustible vapours

Answer 1

Hint: The chemical name of \[CC{{l}_{4}}\]is carbon tetrachloride. It is an organic chemical. The melting point of carbon tetrachloride is 22.4 \[^{o}C\] and the boiling point is 76.72\[^{o}C\]. Means it has low melting point and has high boiling point.

Complete answer:
\[CC{{l}_{4}}\]is used as fire extinguishers under the name of pyrene.
The dense vapours of carbon tetrachloride forms a protective layer on the burning objects and avoids the oxygen or air to come in contact with the fire from the burning objects and provides incombustible vapours.
So, the correct answer is “Option D”.

Additional Information:
Carbon tetrachloride is a colorless liquid and nor soluble in water.
It has a sweet odour that can be detected at low levels.
Carbon tetrachloride is used in dry cleaning, removal of grease from metals.
It is used in manufacturing refrigerants and aerosol propellants.
It is a carcinogen, inhalation or ingestion of it causes damage to the brain, liver, kidneys, and sometimes even causes death also.
It is used in proton NMR spectroscopy.
Carbon tetrachloride is extensively used as a precursor to chlorofluorocarbons (CFCs). Though, due to environmental concerns, the production of carbon tetrachloride has seen a sharp decline from the 1980’s.

Note: We can use \[CC{{l}_{4}}\] in the home as a spot remover of fire but it is better to avoid the usage of it because of its poisonous nature. The structure of the carbon tetrachloride is tetrahedral and it resembles the structure of methane.