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Hydrocarbons

Long Answer Type

211.

What are the characteristics of a compound to be aromatic?
Or
What do you mean by aromaticity?
Or
What are the necessary conditions for any system to be aromatic?

231 Views

212.

Write a short note on annulenes.

184 Views

Short Answer Type

213.

Explain why the following systems are not aromatic?

307 Views

Long Answer Type

214. Give the various methods used for the preparation of arenes.

(i) From acetylene: By passing vapours of acetylene through the red-hot iron tube.

(ii) From chlorobenzene: By reducing chlorobenzene with Ni-Al alloy/NaOH.

(iii) From sodium benzoate: By heating sodium benzoate with soda lime (Laboratory method).

(iv) From phenol: By distilling phenol with zinc dust.

(v) From benzene sulphonic acid: By heating benzene sulphonic acid with super heated steam.

(vi) From benzene diazonium chloride: By treating benzene diazonium chloride with hypophosphorous acid (H₃PO₂) in the presence of Cu⁺ ions.

(vii) By Wurtz-Fittig reaction: By treating halorene and haloalkane with sodium metal in the presence of dry ether.

139 Views

Short Answer Type

215.

How would you convert the following compounds to benzene:
Ethyne

152 Views

216.

How would you convert the following compounds to benzene:
Ethene

133 Views

217.

How would you convert the following compounds to benzene:
Hexane

308 Views

Long Answer Type

218.

How would you convert the following compounds to benzene:
(i) Benzoic acid
(ii) Benzene diazonium chloride?

529 Views

219.

Discuss the halogenation reactions of arenes.

260 Views

220.

Discuss:
(i) nitration and (ii) sulphonation of benzene.

211 Views