Halogenated compounds persist in the environment for a long time. What is the reason for this?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → They resist breakdown by soil bacteria
Most natural organic matter is broken down by the bacteria in soil. Halogenated compounds resist this breakdown, so they are not removed and remain in the environment for a long time.
NCERT (2026-27 edition):
Unit 6 Haloalkanes and Haloarenes – “Halogenated compounds persist in the environment due to their resistance to breakdown by soil bacteria.”