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  4. The compound, which decolorize bromine water but does not react with Tollens reagent is:

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Q. The compound, which decolorize bromine water but does not react with Tollens reagent is:

Rajasthan PMTRajasthan PMT 2004

Solution:

Ethene and ethyne are unsaturated hydrocarbons, hence ' they decolourise-bromine water. But ethene does not react with Tollen's reagent while acetylene give white .silver acetylide with it.
$CH _{2}= CH _{2}+ Br _{2} \longrightarrow CH _{2} Br - CH _{2} Br$