What are the $IUPAC$ names of the insecticide $DDT$ and benzenehexachloride? Why is their use banned in India and other countries?

(N/A) The $IUPAC$ name of $DDT$ is $1,1,1-\text{trichloro}-2,2-\text{bis}(4-\text{chlorophenyl})\text{ethane}$.
The $IUPAC$ name of benzenehexachloride $(BHC)$ is $1,2,3,4,5,6-\text{hexachlorocyclohexane}$.
Their use is banned because these substances are non-biodegradable and highly toxic.
Furthermore,they are lipophilic,meaning they accumulate in the fatty tissues of organisms and undergo biomagnification,leading to increased concentrations as they move up the food chain.