Which of the following reagent is used to find out carbon-carbon multiple bonds?

Which of the following reagent is used to find out carbon-carbon multiple bonds?
  1. Grignard reagent
  2. Baeyer’s reagent
  3. Sandmeyer’s reagent
  4. Gattermann reagent

Solution

With cold dilute alkaline $\mathrm{KMNO}_4$ (Baeyer's reagent), alkenes give addition products and the purple colour of $\mathrm{KMNO}_4$ disappears.

Asked in: AP EAMCET 2015

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