Leah.J
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or just Bromine water ?
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sotor
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bromine water is just Br2. bromine is liquid at RTP
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Leah.J
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(Original post by sotor)
bromine water is just Br2. bromine is liquid at RTP
yeah but in a question about the differences between bromination of benzene and bromination of phenol in today's mock I wrote that Phenol reacts with Br2 at room temp. and I was deducted a mark because the mark scheme says bromine water .. so I'm confused
Would Phenol react with Br2 liquid at room temp. ?
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Pigster
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(Original post by Leah.J)
yeah but in a question about the differences between bromination of benzene and bromination of phenol in today's mock I wrote that Phenol reacts with Br2 at room temp. and I was deducted a mark because the mark scheme says bromine water .. so I'm confused
Would Phenol react with Br2 liquid at room temp. ?
Which exam board MS required the water?
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Leah.J
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(Original post by Pigster)
Which exam board MS required the water?
Edexcel.
Here's the paper and mark scheme
Q21 (b)

I'm trying to attach the mark scheme but for some reason, I keep getting an error so here's a screenshot instead

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Morcatic
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(Original post by Leah.J)
or just Bromine water ?
Bromine water is just Br2 (aq).
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Pigster
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(Original post by Leah.J)
Edexcel.
Here's the paper and mark scheme
Q21 (b)

The mark scheme won't upload for some reason so I'm gonna try attaching it above.
Your spec says: 18A 6. "understand the reaction of phenol with bromine water"

I'd always go with what the spec says.

I'll still be interested to see the MS.
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Pigster
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(Original post by Leah.J)
or just Bromine water ?
In answer to your OP, phenol will react with both. But, like I just said, your spec expects the reaction with Br2(aq).
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Leah.J
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(Original post by Pigster)
Your spec says: 18A 6. "understand the reaction of phenol with bromine water"

I'd always go with what the spec says.

I'll still be interested to see the MS.
Here it is :
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Mr.noname
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(Original post by Leah.J)
yeah but in a question about the differences between bromination of benzene and bromination of phenol in today's mock I wrote that Phenol reacts with Br2 at room temp. and I was deducted a mark because the mark scheme says bromine water .. so I'm confused
Would Phenol react with Br2 liquid at room temp. ?
Bromination of phenol requires bromine in the form of an aqueous solution but benzene requires liquid bromine instead. Phenol forms different products if it reacts with bromine in different solvents e.g. In CS2 2,4,6- tribromophenol is not formed.
Last edited by Mr.noname; 1 year ago
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Pigster
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(Original post by Mr.noname)
Bromination of phenol requires bromine in the form of an aqueous solution but benzene requires liquid bromine instead. Phenol forms different products if it reacts with bromine in different solvents e.g. In CS2 2,4,6- tribromophenol is not formed.
BUT: in CS2, a mixture of 2-bromophenol and 4-bromophenol forms. The OP asked whether a reaction took place, rather than would 2,4,6-tri form.

The QP and MS that Edexcel produced in a way was incorrect as a candidate could describe the production of 2- or 4- and not be credited.
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Mr.noname
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(Original post by Pigster)
BUT: in CS2, a mixture of 2-bromophenol and 4-bromophenol forms. The OP asked whether a reaction took place, rather than would 2,4,6-tri form.

The QP and MS that Edexcel produced in a way was incorrect as a candidate could describe the production of 2- or 4- and not be credited.
In part a an equation is required to be completed to show the formation of 2,4,6-tribromophenol so I believe that is the reaction which was the focus of the question, hence it was required to state that aqueous needed for this reaction.
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charco
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The focus of the question is the greater reactivity of phenol compared to benzene.
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