But-2-ene on reaction with alkaline KMnO_{4} at elevated temperature followed by acidification will give:

  • Option 1)

     2 molecules of CH_{3}COOH

  • Option 2)

    2 molecules of CH_{3}CHO

  • Option 3)

    one molecule of CH_{3}CHO and one molecule of CH_{3}COOH

  • Option 4)

Answers (1)

Oxidation of alkene -

Alkene on reaction with cold dilute aqueous solution of KMnO4 (Bayers Reagent) produce vicinal glycol. Decolourisation  of KMnO4 solution is used as a test of unsaturation.

- wherein

 

 

 

CH_{3}-CH=CH-CH_{3}       \xrightarrow[\triangle]{KMnO_{4}}

                                                                                              

                                                                                                        

                                                               2CH_{3}-COOH \overset{[0]}{\leftarrow} 2CH_{3}-CHO

\therefore option (1) is correct

 


Option 1)

 2 molecules of CH_{3}COOH

Option 2)

2 molecules of CH_{3}CHO

Option 3)

one molecule of CH_{3}CHO and one molecule of CH_{3}COOH

Option 4)

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