Question

To which class of pesticides do DDT, BHC, aldrin and endosulfan belong?
(A) Carbamates
(B) Organophosphates
(C) Organochlorines
(D) Biopesticides

Answer 1

Hint: This is a chlorinated hydrocarbon organic compound which decomposes very slowly. It has a very vast application in chemical industries and in agriculture, known for their high toxicity, slow degradation and bioaccumulation. It is widely used to protect crops,livestock and household damage from insects.

Complete answer:
To answer this question you must know about pesticides DDT, BHC, aldrin and endosulfan.
pesticides are groups of chemicals used for destruction of insects, weeds, fungi, bacteria etc. They are generally called insecticides, fungicides, bactericides, herbicides and rodenticides.
pesticides are classified based on their chemical nature such as carbamates, biopesticides, organochlorines and organophosphate etc.
Organochlorines are a group of chlorinated compounds widely used as pesticides. Due to their low cost and the need against various pests, organochlorine insecticides such as DDT, BHC, aldrin and endosulfan are among most widely used pesticides in the developing countries of asia.
Organophosphates are esters of phosphoric acid, degrade rapidly by hydrolysis on exposure to light, air and soil. examples include malathion, fenthion diazinon etc.
carbamates are organic compounds derived from carbamic acid and the functional group in carbamate is carbamate esters. Examples include oxamyl, methomyl, thiodicarb etc.
Biopesticides are derived from natural materials such as plants, animals, bacteria, and certain minerals.

Since DDT, BHC, aldrin and endosulfan are the examples of organochlorine pesticides therefore the correct answer is (C) Organochlorines.

Note:-
Organochlorines have extremely strong bonds between their chlorine and carbon components, are attracted to the fats and they are highly insoluble in water. But the problem with this is its strength: if organopesticides are used at once they stay around for a long time, not only in water and in the soil but also in human and animal bodies.