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Haloarene is ortho and para directing Ex...

Haloarene is ortho and para directing Explain.

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Haloarenes (say chlorobenzene) is a resonance hybrid of following live structures.

Resonance leads to lowering of energy (resonance energy) and hence greater stability. On the other hand, in haloalkanes (say chlorometliane) no such resonance is possible. Thus, we can say that haloareries are more stable than laloalkanes. Halogers directly attached to benzene ring are o, p-directing in electrophilic substitution reactions. This is due to greater electron density at these positions in resonating. Structures II, III and IV. Greater electrons density leads to preferential attack of electrophile on these positions, leading to o-and p-substituted products.
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BETTER CHOICE PUBLICATION-HALOALKANES AND HALOARENES-QUESTIONS
  1. Why does electrophilic substitution take place at ortho and para posit...

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  2. Why does electrophilic substitution take place at ortho and para posit...

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  3. Haloarene is ortho and para directing Explain.

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  4. Write short notes on : Wurtz reaction

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  5. Write Fittig reaction.

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  6. Write short notes on : Friedel Craft's reaction

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  7. Write Fittig reaction.

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  8. Write Ullmann reaction.

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  9. Write the following reactions : Friedel Craft alkylation.

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  10. Name the reagent used to convert 1-chloroproane to 1- nitropropane.

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  11. Name the reagent used to convert bromoethane to ether.

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  12. Write a chemical reaction to illustrate Saytzeff's rule.

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  13. Which metal is used in the preparation of Grignard's regent from haloa...

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  14. Explain why Grignard reagents should be prepared under anhydrous con...

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  15. The treatment of alkyl chlorides with aqueous KOH leads to the formati...

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  16. The treatment of alkyl halides with alcoholic KOH leads to the formati...

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  17. Complete the following reaction : CH3 CH2 Br + KOH(aq) to

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  18. Write the structure of the major organic product in each of the follow...

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  19. Explain why is thionyl chloride method preferred for preparing alkyl c...

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  20. Out of HCl and SOCl2 which is preferred for converting ethanol into ch...

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