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Hydrocarbons

Short Answer Type

51.

State Huckel's rule.

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52.

Name three heterocyclic compounds which are aromatic in nature.

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53.

Will cyclo-octatetraene show aromatic character?

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54.

Cyclobutadiene is not aromatic. Explain.

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55.

what are annulenes? Give one example.

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56.

Which of the following exhibits aromaticity:
(i) Cyclo - octatetraene (ii) Cyclopentadiene (iii) Tropylium cation?

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57.
Give two examples of ions which are non-aromatic. Why don't they exhibit aromaticity?

Cyclopentadienyl cation and cyclo-heptatrienyl anion are non-aromatic. They do not exhibit aromaticity as they do not fulfil Huckel’s rule i.e. (4n + 2)

electron rule.

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58.

Is benzene same as 1, 3, 5-cyclohexatriene?

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59.

What is the role of catalyst in electrophilic substitution reactions?

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60.

Name the catalysts used in electrophilic aromatic substitution reactions.

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Previous Year Papers

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Test Yourself

Short Answer Type

57. Give two examples of ions which are non-aromatic. Why don't they exhibit aromaticity?

57.
Give two examples of ions which are non-aromatic. Why don't they exhibit aromaticity?