A) \[NaOH+CaO\]
B) Cold dilute alkaline \[KMn{{O}_{4}}\]
C) \[C{{l}_{2}}/hv\]
D) \[KOH/{{C}_{2}}{{H}_{5}}OH\]
Correct Answer: B
Solution :
Unsaturation in alkene or alkyne or in any organic compound is detected by reacting the organic compound with alkaline \[\text{KMn}{{\text{O}}_{4}}\] (Baeyers reagent) or bromine water. Both bromine water or alkaline \[\text{KMn}{{\text{O}}_{4}}\]are decolourised after the reaction with unsaturated compound. \[2KMn{{O}_{4}}+2KOH\xrightarrow{{}}2{{K}_{2}}Mn{{O}_{4}}+{{H}_{2}}O+[O]\] \[\underset{C{{H}_{2}}}{\overset{C{{H}_{2}}}{\mathop{||}}}\,\underbrace{{{H}_{2}}O+[O]}_{\text{Alkaline}\,\text{KMn}{{\text{O}}_{\text{4}}}}\xrightarrow{{}}\underset{\begin{smallmatrix} \text{Ethylene}\,\,\text{glcol} \\ \,\,\text{colourless} \end{smallmatrix}}{\mathop{\underset{C{{H}_{2}}OH}{\overset{C{{H}_{2}}OH}{\mathop{|}}}\,}}\,\]
You need to login to perform this action.
You will be redirected in
3 sec
