OCR Chemistry A F324 Rings, Polymers and Analysis Tue 19 June 2012

describe the bonding on benzene?

how do we represent secondaty amine?

In a formula? NH('first chain')('second chain') is probs easiest.

OK worked it out to be methanol but I did a lot of Maths stuff so unlikely this will be an exam question, here is my working.

55.22=(59+(A-17))/(102+A) x100

0.5522(102+A)=59-17+A

56.3244+0.5522A=42+A

56.3244-42=0.4478A
A=31.98838767 roughly 32 RFM

which is methanol only one that fits.

but i dont get why they put like N,N e.t.c ?

Are you talking about an azo group? :/

No literally write lets say for example this
CH3CH2CH2NH2CH2CH3

how would u name this ?

do you talk about delocolised , p oribatals overlap (doing drawing) , trigonal planar 120 , planar molecule ?

That's a secondary amine you need to remove a h off N then it'd be called N-ethyl propyl amine


This was posted from The Student Room's iPhone/iPad App

Yes, I think we might will have a 5 marker for this

thanks but there are 5 carbons though?and where is the ethyl from

No literally write lets say for example this
CH3CH2CH2NH2CH2CH3

how would u name this ?

how do we represent secondaty amine?

You've got two separate alkyl chains. If you wanted all five then you'd put the molecule as ch3ch2ch2ch2ch2NH2 that's how it'd be pentylamine then it'd be primary

You put ch3ch2ch2 NH ch3ch2

The chains are separate so when naming you do it alphabetically N-ethyl propylamine understand?


This was posted from The Student Room's iPhone/iPad App

ammonia with 2 H atoms replaced by a hydrocarbon chain (so only shows 1 C).

Do you mean CH3CH2CH2NHCH2CH3 (only one H can be on N if it's a non charged compound)?

You'd take a look at both of the chains attached to the N. One has 3 carbons the other has 2. You should know that a hydrocarbon missing one hydrogen forms an alkyl. So first chain is propyl and second is ethyl bonded to an amine, put that all together, you'd get ethylpropylamine.

yep and do we put N,N so we remove two hydrogens

No in the book they do that cause it's a tertiary amine. You don't need to put N,N you can just put N-ethyl propylamine


This was posted from The Student Room's iPhone/iPad App

i hope so those will be nice marks to get any others will there be carbon or NMR u think or both and will they be hard or easy ?

I think we might get an NMR but not a graphical one, instead a structure.. not certain (obv)