Question

double bond alkenes are detected by adding ? a-liquid b- liquid br2 c- liquid cl d- Baeyer s reagent

Answer 1

your and is liquid br that is bromine water

Ethene and chlorine or bromine or iodine

CH2=CH2 + BR2  ----->BRCH2-BRCH2

In each case you get an addition reaction. For example, bromine adds to give 1,2-dibromoethane.

Alkenes and bromine water

Using bromine water as a test for alkenes . If you shake an alkene with bromine water (or bubble a gaseous alkene through bromine water), the solution becomes colourless. Alkenes decolourise bromine water.

HOPE THAT HELPS YOU!!!!

Answer 2

Double bound in alkenes are detected by Baeyer's reagent.