Question

Write full form or name of DDT and BHC.

Answer 1

Hint: Organic compounds of haloarenes are used as important insecticides. Both of these organic compounds consist of chlorine combining with benzene. They both are very hazardous in nature and are banned in various parts of the world.

Complete answer:
DDT is a popular insecticide, it is chemically stable and not metabolized rapidly, and is stored in the fatty tissues. It is non – biodegradable in nature. Its structure consists of 2 phenyl rings having chlorine, attached together with a trichloroethane.
DDT stands for dichloro diphenyl trichloroethane, or $p$,$p^{{}^{\prime }}$- dichlorodiphenyltrichloroethane. The IUPAC name of DDT is 2,2 bis (4-chlorophenyl)-1,1,1-trichloroethane. Its structure is as follows:
  

BHC is also an insecticide, it is highly toxic. It is formed by the reaction of benzene with excess chlorine in the presence of sunlight. The reaction is a substitution reaction. BHC stands for benzene hexachloride. It is also called lindane, or gammaxane. Its structure consists of a benzene ring with chlorine atoms on all the 6 carbons. The structure is as follows:

Hence, DDT stands for dichloro diphenyl trichloroethane, and BHC stands for benzene hexachloride.

Note:
BHC is banned in various countries because it has been found to be a human carcinogen, which can spread cancer. Apart from the substitution reaction with sunlight, BHC can also be formed with chlorination of benzene using certain catalysts. DDT was used during World War 2 for preventing mosquitoes that spread malaria and typhoid. DDT is banned in US.