Account for following: (a) Use of DDT was banned in United States in 1973. (b) Benzylic halides show high reactivity towards S_(N)1 reaction.

Account for following: (a) Use of DDT was banned in United States in

1.	Account for following: (a) Use of DDT was banned in United States in 1973. (b) Benzylic halides show high reactivity towards S_(N)1 reaction.
Answer» SOLUTION :(a) Because of chemical stability of DDT and its fat stability, it is not metabolised very RAPIDLY by animals. Rather it gets deposited and stored in fatty tissues. This raised alarming danger due to its toxic effects. Therefore, its use has been banned in U.S.A. (b) BENZYLIC halides show high reactivity towards `S_(N)1` reactions because benzyl carbocation formed is HIGHLY stable through resonance.