Question

Give a simple test to distinguish between benzene and cyclohexene.

Answer 1

Hi friend,

you may perform bromine in

C/Cl4/ CH2Cl2 test in the presence of light.

Cyclohexene will undergo free radical reaction with bromine in the presence of light. which is indicated by the lost of orange colour of bromine upon addition of cyclohexene exposure to light for 10 minutes.

On the other hand benzene will not react with bromine upon exposure to light since bromination reaction of benzene will require a catalyst . the orange colour of test solution will remain upon addition of benzene and exposure to light for 10 minutes....i hope it helps you

mark meas a brainlist.

Answer 2

Hey dear,

● Benzene Vs Cyclohexene -
- Cyclohexene has single double bond while benzene has 3 delocalized double bonds.
Cyclohexene when treated with Br2/CCl4 to give 1,2-dibromocyclohexane. During this colour of Br2/CCl4 disappears.
C6H10 + Br2 --> C6H10Br2

Benzene on the other hand shows resonance structures due to delocalization of electrons. Therefore, it doesn't react with Br2/CCl4 & no change is observed.
C6H6 + Br2 --> NO REACTION

Hope this helps you.