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Explain why the following systems are no...

Explain why the following systems are not aromatic?

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In the compound, the carbon atom marked by * is `sp^3` hybridised. Therefore, the system is not planar. Although it contains `6-pi` electrons, but they are not delocalised in the ring system. Therefore, it lacks aromatic character.
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ICSE-HYDROCARBONS -NCERT TEXT-BOOK EXERCISES
  1. Why is benzene extra ordinarily stable though it contains three double...

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  2. What are the necessary conditions for any system to be aromatic?

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  3. Explain why the following systems are not aromatic?

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  4. Explain why the following systems are not aromatic?

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  5. Explain why the following systems are not aromatic?

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  6. How will you convert benzene into (i) p-nitrobromobenzene (ii) m-...

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  7. How will you convert benzene into (a) p-nitrobromobenzene (b) m-nitrob...

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  8. How will you convert benzene into (i) p-nitrobromobenzene (ii) m-...

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  9. How will you convert benzene into (i) p-nitrobromobenzene (ii) m-...

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  10. In the alkane H3C-CH(2)-C(CH(3))2-CH(2)-CH(CH(3))2, identify 1^(@),2^(...

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  11. What effect does branching of an alkane chain has on its boiling point...

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  12. Addition of HBr to propene yields 2-bromopropane, while in the presenc...

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  13. Write down the products of ozonolysis of 1, 2-dimethylbenzene (o-xylen...

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  14. Arrange benzene, n-hexane and ethyne in decreasing order of acidic beh...

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  15. Why does benzene undergo electrophilic substitution reactions easily a...

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  16. How would you convert the Ethyne compounds into benzene?

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  17. How would you convert the following compounds into benzene? (i) Ethy...

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  18. How would you convert the following compounds into benzene? (i) Ethy...

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  19. Write structures of all the alkenes which on hydrogenation give 2-meth...

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  20. Arrange the following set of compounds in order of their decreasing re...

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