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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.

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179.
Why do alkynes undergo electrophilic addition reactions ?

The electrophilic addition reactions take place in alkynes due to the presence of high electron density in the triple bond. This means that – C ≡ C – can act as a source of electrons. There are certain reagents (electrophiles) which are capable of adding to alkyne molecules forming an addition compound. Since such reactions are initiated by the electrophiles and hence are known as electrophilic addition reactions.