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Hydrocarbons

Short Answer Type

171.

Give reduction of phenol ?

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Long Answer Type

172.

Discuss in brief the polymerisation reactions of alkenes ?

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Short Answer Type

173.

Enlist three uses of ethylene.

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Long Answer Type

174.

What are alkynes?

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175.

For the following compounds, write structural formulas and IUPAC names for all possible isomers having the number of double or triple bond as indicated:

$left parenthesis straight i right parenthesis space space straight C subscript 4 straight H subscript 8 left parenthesis one space double space bond right parenthesis left parenthesis ii right parenthesis space straight C subscript 5 straight H subscript 8 space left parenthesis one space triple space bond right parenthesis$

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176. Write structures of different isomers corresponding to the 5th member of alkyne series. Also, write IUPAC names of all the isomers ?

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Short Answer Type

177.

How is acetylene obtained from:
(i) Ethylene dibromide?
(ii) Tetrabromoethane ?

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Long Answer Type

178.
Discuss the preparation of higher alkynes.

Preparation of higher alkynes. Higher members of alkynes are prepared from acetylene. It involves two steps:

(i) Acetylene is treated with sodamide in liquid ammonia, sodium acetylide is produced.

(ii) Sodium acetylide is then treated with proper alkyl halide, higher members of alkynes are produced.