A) Explode when mixed with chlorine
B) Decolourise Baeyer's reagent giving brown precipitate
C) Rapidly absorbed by cold conc. \[{{H}_{2}}S{{O}_{4}}\]
D) Form white precipitate with silver nitrate solution
Correct Answer: B
Solution :
\[C{{H}_{2}}=C{{H}_{2}}+\underset{\text{alk}\text{.}}{\mathop{KMn{{O}_{4}}}}\,\underset{{{H}_{2}}O}{\mathop{\xrightarrow{[O]}}}\,\underset{OH}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,}}\,\underset{\text{Colour}\,\text{less}}{\mathop{-\underset{OH\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}\,}}\,}}\,+}}\,\underset{\begin{matrix} \text{Brown} \\ {} \\ \end{matrix}}{\mathop{Mn{{O}_{2}}}}\,\] \[CH\equiv CH+\underset{alk.}{\mathop{KMn{{O}_{4}}}}\,\xrightarrow{[O]}\underset{\text{Oxalic acid}}{\mathop{\underset{COOH}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{COOH}}\,}}\,}}\,+\underset{\begin{matrix} {} \\ \text{Brown} \\ \end{matrix}}{\mathop{Mn{{O}_{2}}}}\,\]
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