Question

When ethanol vapour is passed through bromine water, why does no change occur?

Answer 1

The presence of the double bond in alkenes makes them more reactive than alkanes. An alkene will turn brown bromine water colourless as the bromine reacts with the carbon-carbon double bond. In fact this reaction will occur for unsaturated compounds containing carbon-carbon double bonds.

Answer 2

Dear Student,

◆ When ethanol vapour is passed through bromine water, no change occurs because -

• Bromine water test is used for detection of unsaturated hydrocarbons.
• When alkene/alkyne are treated with bromine water, their bromination occurs leading to colourless solution.
• As ethanol is an alcohol and have no double/triple bond, it does not react with bromine water.

Thanks dear...