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

Options

A. Grignard reagent
B. Baeyer's reagent
C. Sandmeyer's reagent
D. Gattermann reagent

Answer

B

Explanation

With cold dilute alkaline
`KMnO_(4)`(Baeyer.s reagent), alkenes give 1,2-glycols, e.g.
`CH_(3)-CH=CH_(2)+H_(2)O+[O]`
`(KMnO_(4))/(KOH)CH_(3)-CHOH-CH_(2)OH`
Propene propylene glycol
On reaction with Baeyer.s reagent, terminal alkynes give carboxylic acids while non-terminal alkynes give diketones.
`CH_(3)-C-=CH+3[O]underset(298-303K)overset(KMnO_(4)//KOH)(to)CH_(3)COOH+CO_(2)`
Propyne
`CH_(3)-C-=C-CH_(3)+2[O]overset(KMnO_(4)//KOH)underset(298-303K)(to)CH_(3)-overset(overset(O)(|\|))(C)-overset(overset(O)(|\|))(C)-CH_(3)`