benzene reaction

Watch this thread
Citron009
Badges: 3
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 4 years ago
#1
can we consider bromination of benzene is an example of test for unsaturation? (bromine decolorise..)
0
reply
charco
Badges: 18
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 4 years ago
#2
(Original post by Citron009)
can we consider bromination of benzene is an example of test for unsaturation? (bromine decolorise..)
no, benzene does not decolourise bromine water in the absence of UV light
0
reply
ChemistryWebsite
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
Report 4 years ago
#3
No, there will be no reaction with just benzene and bromine. It is necessary to have FeBr3 present as catalyst. Without the catalyst bromine will not form a strong enough electrphile.
This is because the unsaturated nature of benzene is very different to the unsaturated nature of an alkene.

Therefore benzene will not cause discolouration of bromine water.
0
reply
C_Yap
Badges: 17
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
Report 4 years ago
#4
Benzene is less reactive due to the delocalised right of electrons, meaning that it's unable to undergo electrophilic addition reactions with bromine water.

Electrophilic addition disrupts the delocalised ring, which reduces the stability of the molecule. This is why benzene does not tend to undergo addition reactions.
0
reply
Citron009
Badges: 3
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#5
Report Thread starter 4 years ago
#5
ok..thank you for your response,
Br-Br bond breaking, so shall we write bromine decolorise as an observation..?
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Y13's - If you haven't confirmed your firm and insurance choices yet, why is that?

I am waiting until the deadline in case anything in my life changes (18)
20.69%
I am waiting until the deadline in case something else changes (e.g. exams/pandemic related concerns) (11)
12.64%
I am waiting until I can see the unis in person (5)
5.75%
I still have more questions before I make my decision (15)
17.24%
No reason, just haven't entered it yet (19)
21.84%
Something else (let us know in the thread!) (19)
21.84%

Watched Threads

View All