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Methyl groups are approximately the same size as chlorine atoms, but hydrogen atoms are much smaller. Would you expect insect

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Answer #1

(a): Since both CCl3 and C(CH3)3 have similar size, the insecticidal property will exist, but it will decrease many fold. Because -Cl atoms are responsible for insecticidal property. Hence -CCl3 has highest insecticidal property.

(b): The insecticidal property in DDT is mainly due to those those two para-Cl atoms. Hence when we replace them by H atoms, there will be no more insecticidal property.

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