Question

Which of the following represents Westrosol?
(A) $ CHC{{l}_{3}} $
(B) $ C{{H}_{2}}C{{l}_{2}} $
(C) $ CHC{{l}_{2}}C{{H}_{2}}Cl $
(D) $ CC{{l}_{2}}=CHCl $

Answer 1

Hint: We need to find the formula of Westrosol. It is obtained by passing westron vapours that overheat two compounds. Westron is also known as dichloromethane. The reaction results in formation of an unsaturated compound.

Complete step by step answer
We already know that Westrosol is formed from Westron vapours.
When westron vapours are passed over heated $ BaC{{l}_{2}} $ ​ or lime, westrosol is obtained.
 $ C{{l}_{2}}CH+CHC{{l}_{2}}\to C{{l}_{2}}C=CHCl $
Its chemical name is trichloro- ethylene.
So, we need to see from the above options, and select the correct value.
Thus, the correct answer is option D.

Additional Information
 $ BaC{{l}_{2}} $ is barium chloride. It is commonly used as a test for sulphate ions. It is a white solid which is water-soluble, hygroscopic and gives a slight yellow-green colour to a flame. In industry, Barium Chloride is mainly used in the purification of brine solution in caustic chlorine plants and also in the manufacture of heat treatment salts, case hardening of steel, in the manufacture of pigments, and in the manufacture of other barium salts.
Lime or Calcium hydroxide, also called slaked lime, $ Ca{{\left( OH \right)}_{2}} $ , is obtained by the action of water on calcium oxide. When mixed with water, a small proportion of it dissolves, forming a solution known as limewater, the rest remaining as a suspension called milk of lime.

Note
Westron (Tetrachloroethane) is a heavy in-flammable liquid and used as a solvent of rubber, varnish, paint and fats etc and westrosol is Trichloroethene and used in dry-washing of cloths. The chemical compound trichloroethylene is a halocarbon commonly used as an industrial solvent. It is a clear, colourless non-flammable liquid with a chloroform-like sweet smell. It is found from studies that trichloroethylene is human carcinogen which means that it is carcinogenic to humans.