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Q.

Which solvent is used for dry-cleaning of clothes?

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a

Acetone

b

Carbon tetrachloride

c

Alcohol

d

Freon

answer is A.

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Detailed Solution

Dry cleaning is the process of washing clothing solely using organic, non-polar solvents and without the use of water. The solvent should be designed so that it evaporates quickly and doesn't require heat to dry.

We are aware that the components of carbon tetrachloride are one carbon atom and four chlorine atoms. The carbon is capable of four sp3 bonds.
As a result of hybridization, a sigma bond forms, resembling the methane molecule's four hydrogens connected to a carbon atom.
Each chlorine atom in carbon tetrachloride has two free electrons, which results in a net dipole charge of zero and renders the compound non-polar.

Alcohol is polar and contains oxygen and hydrogen, which will bind with water. Polar solutes will dissolve in the alcohol as a solvent. It is difficult to evaporate.
The ketone group in acetone makes it polar. It quickly evaporates but is useless as a cleaning agent since it won't form connections with nonpolar molecules like dirt and oil, making it impossible to clean greasy garments.
Freon is not at all utilised as a dry cleaning solvent since it corrodes the surface it comes in contact with and destroys the beads. It is quite dangerous since it burns easily. It is inapplicable to daily life. Different types of Freon are known.

Hence, the correct option is (A).

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