what where the two other structural isomers for 3-bromophenylamine ? and what did you say about why there were isomers formed?
NO2 is a 3 directing group, NH2 is a 2,4 directing group
Isomers will differ depending on whether you reduce it to NH2 before or after bromination
If its reduced to NH2 AFTER bromination, only 3-bromophenylamine is formed because NO2 will direct to the 3 position If it's reduced BEFORE bromination, 2-bromophenylamine and 4-bromophenylamine will form instead because NH2 directs to the 2 and 4 positions
It said give the structure of L, nothing about M. So I hope not.
I think you just had to use the IR spec of M and N to make you realise that L was an ester, agreed there was nothing about showing the structure of M and N in the question
I think you just had to use the IR spec of M and N to make you realise that L was an ester, agreed there was nothing about showing the structure of M and N in the question
I believe chromatography wasn't necessary. I put filtration under reduced pressure followed by recrysalisation. Didn't it want to know how to purify it?
I wrote that too but also dissolve in ethanol first, but many people are saying melting points .. so I'm unsure now
I wrote that too but also dissolve in ethanol first, but many people are saying melting points .. so I'm unsure now
The question specifically asked how to 'check the purity', idk what that means but I'm guessing something like chromatography or melting point determination to check if its pure or not
Surely you don't have to show M and N; it wasn't asked in the question. Also probably would have been more marks if they wanted all three structures to be identified.
Surely you don't have to show M and N; it wasn't asked in the question. Also probably would have been more marks if they wanted all three structures to be identified.
Also why would they ask that if M and N are implicit in your structure of L, that requires no thinking whatsoever lol
What are we thinking for grade boundaries? I thought that was pretty easy and I finished before my extra time which I never do... So I'm thinking high grade boundaries for that one?
Was amount of water molecule 6.02x10^22? For organic compound for complete combustion was it C3H9? For naming the compounds I put both 3-methyl hexan-1-ol
The question specifically asked how to 'check the purity', idk what that means but I'm guessing something like chromatography or melting point determination to check if its pure or not
I put melting point, if compound is pure then the melting point will be over 1-2 degrees. You can also compare with the actual boiling point too, although I don't think I mentioned that part
I never thought about chromatography either, but dissolving the solid in a solid then running a TLC against pure 3-nitrobenzoic acid should also show how pure it is.
Only problem I had with the paper was that stupid question about beta-carotene - I got 11 C=C bonds, but then I left the rest blank so thats 2-3 marks already gone.