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171.
Give reduction of phenol ?

Reduction of phenol : Phenol is reduced to benzene by passing its vapours over-heated zinc dust.

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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:

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