Answer: A non-biodegradable persistent organic pollutant.
- A A strongly corrosive mineral-type acid that damages plant tissue
- B A non-biodegradable persistent organic pollutant
- C A compound that readily dissolves in water and washes away harmlessly
- D An emitter of ionising radiation that damages cellular DNA
Correct answer: B. A non-biodegradable persistent organic pollutant
Explanation: DDT is chemically stable and resists biodegradation; it accumulates in fatty tissues of organisms and causes biomagnification in food chains.
SN2 proceeds in a single step with backside attack and inversion of configuration, while SN1 forms a planar carbocation intermediate first, leading to racemisation.
Concept context
Study carbon-halogen compounds: how they are made, how they react via SN1/SN2 and elimination, their stereochemistry, and their environmental impact.