Question

Phosgene can be obtained when :
A.White phosphorus reacts with alkali
B.Calcium phosphide reacts with water
C.Chloroform reacts with air
D.Bone comes in contact with water

Answer 1

Hint: Phosgene is not found in the environment naturally and is obtained from the chlorinated hydrocarbons. These Chlorinated solutions are used in varied industrial process such as dry cleaning or metal cleaning

Complete step by step answer:
As we know phosgene is mainly obtained from chlorinated from the chlorinated hydrocarbons, by looking at the above questions, we can say chloroform when it reacts with Air gives phosgene and hydrochloric acid.
The Reaction is given below:
\[CHC{l_3} + {O_2} \to COC{l_2} + HCl\]
Phosgene is also known as Carbonyl Dichloride. Its properties includes:
-Highly toxic in nature and was used in world war 1 and caused majority of deaths
-It is Non-flammable in nature
-It is colorless and exists gas
-It is heavy in nature and remains close to gas when liquid phosgene is exposed to air.
-It is volatile in nature
-Phosgene is non-combustible in nature
-When exposed to water phosgene reacts slowly with water to form carbon dioxide and hydrochloric acid.
Whereas, when White phosphorus reacts with the alkali, Phosphine and hypophosphite ion are produced. Also, when Calcium phosphide reacts with water, Phosphine and calcium hydroxide are obtained.
Hence the correct option is option C.

Note:
Commercially phosgene is obtained from reacting carbon monoxide and chlorine. It is vastly used in industry to produce pesticides, metal cleaning liquids or plastics. Also phosgene is used to manufacture products such as flexible or rigid foam, polyurethane or sealants and adhesives.