alkanes and alkenes question (1 Viewer)

[swirlyy]

For the prac on the cycloalkanes, cycloalkenes and bromine water, what is the equation of the reaction between the cycloalkene and the bromine water ?


Thanks =]

 

[beentherdunthat]

Cyclohexan + bromine water [aquoes solution of bromine br2] - no reaction

cyclohexene + br2 - addition reaction.

 

[jb_nc]

Cyclohexene reacts because the Br₂ breaks a double bond and joins the molecule at the point where the double bond was (i.e. breaks the pi/sigma bonds to form two pi bonds @ sp³)

C6H10 + Br2 -> C6H10Br2 lol

 

[beentherdunthat]

Or from previous threads =]

cyclohexane with bromine water
C6H12 (aq) + Br2 (aq) - - - > C6H11Br + HBr (with UV)

Cyclohexene

C6H10 (aq) + Br2 (aq) - - - > C6H10Br2

[lol i posted the same thing in the other thread by accident]

 

[swirlyy]

okay, thanks heaps!!

 

[undalay]

Br₂ + H₂O <---> HOBr + Br^- + H⁺


Acyclic Alkenes:
C_nH_2n + HOBR --> C_nH_2nBrOH


Cyclic Alkenes:
C_nH_2n-2+ HOBR --> C_nH_2n-2BrOH


Bromine water they expect HOBr

 

[xiao1985]

Br₂ + H₂O <---> HOBr + Br^- + H⁺


Acyclic Alkenes:
C_nH_2n + HOBR --> C_nH_2nBrOH


Cyclic Alkenes:
C_nH_2n-2+ HOBR --> C_nH_2n-2BrOH


Bromine water they expect HOBr

I concur.

This should be the proper reaction.

 

[Undermyskin]

HOBr is the most accurate one but if you write Br2 (aq) you won't lose mark (if lucky) or just a bit. lolz.

It's like S +O2-> SO2 is the simplest and most popular but to be accurate, you must write: S8 +8O2 -> 8SO2

Cheers.

 

[WantToDoBetter]

Just remember,
Bromine water is brown.
Add cyclohexane=still brown.
Add cyclohexene=decolourisation.
Cheers.