answer each question! ! ! 1. The chemical structure for Alar (daminozide), a pes
ID: 972749 • Letter: A
Question
answer each question! ! !
1. The chemical structure for Alar (daminozide), a pesticide and plant growth regulator that was used orn apples in the 1980s, is given here: H2C- C-N-N CH3 H2C C-OH Would you expect Alar to dissolve in water or fat? Explain your reasoning. 2. The following structure is dichlorodiphenyl trichloroethane (DDT), one of the first successful insecticides. After its introduction in the late 1950s, crop yields improved and the incidence of malaria reduced dramatically in countries where this disease had taken a high toll. DDT is readily absorbed by insects and is stable in the environment, so its effectiveness in fields and grain-storage areas is long-lived. However, this longevity is also a problem because DDT accumulates in the fatty tissues (liver, kidneys, and skin) of animals and is passed up the food chain. Top predators such as hawks and eagles car accumulate high levels of DDT; some species have recovered only recently from the decline in reproductive success they suffered because of DDT's toxic effects. For these reasons, DDT has been banned in the United States and many other countries Cl Cl Cl a. Based on its chemical structure, rationalize why DDT is long-lived in the environment and why it collects preferentially in the fatty tissues of animalsExplanation / Answer
1. Alar will dissolve in water rather than in fat because of the polarity of the water. Water is more polar than fat which makes Alar soluble in it.
2. It is better to have polar dominant insecticides so that it is easier to dispose. For example, when water is used to rinse off this insecticides, it will be easier.
3. Toxaphine is more likely to be dissolved in water because of its dominant Cl elements. Comparing it to Malathion, which has a relatively longer chain of nonpolar molecules, Toxaphine will be easier to wash off using water.
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