Answer:
Solvents used to dry clean
clothes are usually chlorinated compounds such as tetra chloroethylene \[(CC{{l}_{2}}=CC{{l}_{2}})\]which
is a potential human carcinogen. These chlorinated compounds also have serious
environmental consequences such as greenhouse effect, ozone depletion, water
pollution, etc.
The use of liquefied carbon dioxide with
a suitable detergent for dry cleaning will not be completely safe from the
point of view of pollution but will be less harmful.
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