A) ethene
B) ethyne
C) propane
D) ethane
Correct Answer: A
Solution :
Ethene and ethyne are unsaturated hydrocarbons, hence they decolorize-bromine water. But ethene does not react with Tollens reagent while acetylene give white silver acetylide with it. \[C{{H}_{2}}=C{{H}_{2}}+B{{r}_{2}}\xrightarrow{{}}C{{H}_{2}}Br-C{{H}_{2}}Br\]
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