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Account for following: (a) Use of DDT ...

Account for following:
(a) Use of DDT was banned in United States in 1973.
(b) Benzylic halides show high reactivity towards `S_(N)1` reaction.

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(a) Because of chemical stability of DDT and its fat stability, it is not metabolised very rapidly by animals. Rather it gets deposited and stored in fatty tissues. This raised alarming danger due to its toxic effects. Therefore, its use has been banned in U.S.A.
(b) Benzylic halides show high reactivity towards `S_(N)1` reactions because benzyl carbocation formed is highly stable through resonance.
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MODERN PUBLICATION-HALOALKANES AND HALOARENES-CONCEPTUAL QUESTIONS
  1. Haloarenes are insoluble in water but are soluble in benzene. Explain.

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  2. The p-isomer of dichlorobenzene has higher melting point than o-and m-...

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  3. Iodoform gives a precipitate with AgNO3 on heating but chloroform does...

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  4. A small amount of ethyl alcohol is usually added to chloroform bottles...

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  5. Organic halogen compounds used in industry as solvents are chlorides r...

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  6. What effect should the following resonance of vinyl chloride have on i...

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  7. Why is vinyl chloride less reactive than ethyl chloride ?

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  8. Why is chloroform not used as anaesthetic these days? What is the comm...

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  9. A hydrocarbon C(5)H(12) gives only one chlorination product. Identify ...

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  10. Predict the order of reactivity of the following compounds in S(N)1 re...

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  11. Allyl chloride is more reactive than n-propyl chloride towards unimo...

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  12. Write the various possible isomers of C(7)H(7)Cl containing benzene ri...

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  13. An alkyl halide with molecular formula C(4)H(9)Br is optically active....

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  14. Which out of the two : 2-cyclopentenol or 3-cyclopentenol has chiral c...

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  15. Allyl chloride is hydrolysed more readily than n-propyl chloride. Why ...

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  16. Write the structure of major monohalo product of the following reactio...

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  17. Account for following: (a) Use of DDT was banned in United States in...

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  18. Why iodoform has appreciable antiseptic property?

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  19. Primary alkyl halide C(4)H(9)Br (a) reacted with alcoholic KOH to give...

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  20. Identify (X) and (Y) in the following:

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