Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    3
    ReputationRep:
    (Original post by Obi-Wan)
    Sorry i know this has been asked before:

    What would be the splitting pattern for CH3-CH2-CH2-CH3 (Butane)?

    I know there are 2 hydrogen environments due to the symmetry, but the symmentry also affects the splitting and I'm confused as to what the effect is exactly. Thanks in advance.
    triplet quartet with integration trace 3:2.
    Offline

    8
    ReputationRep:
    (Original post by lai812matthew)
    just read the book, the page about synthetic methods of aliphatic compounds have a very misleading image, which lead to a lot of people thinking that carboxylic acids could not be reduced. amuses me that they do not include it in the spec, but give questions exactly about reducing carboxylic acids in the exam lol.
    Is this about reducing with nabh4? Because that only reduced carbonyl compounds (ketones and aldehydes). I asked my teacher why we can't use it for carboxylic acid and he said it wouldn't reduce it because it's no strong enough or something like that.

    (Original post by Hunnybeebee)
    Do I have to know that in that much detail?

    So excess ammonia to react with any halogenoalkane present rather than the primary alkane to prevent forming secondary amines. Also reacts with HCl to form NH4+Cl-?

    Posted from TSR Mobile
    No you don't. Just that nh3 is in excess. I was just explaining it so you understand why.

    (Original post by lai812matthew)
    just thinking, they could ask us to suggest a suitable isotope for certain element (e.g. N,P) to perform a magnetic resonance.
    Nitrogen already has an odd number of nucleons. So does P. Do you think the could ask for halogens though. Because they might throw in a molecule containing halogens for the proton name question
    Offline

    1
    ReputationRep:
    (Original post by lai812matthew)
    triplet quartet with integration trace 1:1 .
    Wouldn't the integration be 3:2??
    Offline

    3
    ReputationRep:
    (Original post by biologyworm)
    Wouldn't the integration be 3:2??
    yes i got it wrong
    Offline

    2
    ReputationRep:
    Would an NH2 produce a splitting pattern?
    Offline

    3
    ReputationRep:
    (Original post by lai812matthew)
    just thinking, they could ask us to suggest a suitable isotope for certain element (e.g. N,P) to perform a magnetic resonance.
    What examples would you give for N and P?
    Offline

    3
    ReputationRep:
    (Original post by underestimate)
    Would an NH2 produce a splitting pattern?
    It would produce a single like O-H but with an integration trace of 2.
    Offline

    1
    ReputationRep:
    What are the conditions for diazonium ion + phenol reaction?
    Offline

    3
    ReputationRep:
    (Original post by xMillnsy)
    What are the conditions for diazonium ion + phenol reaction?
    alkaline
    Offline

    8
    ReputationRep:
    I hope they give you the integration values for the name question. It helps me so much
    Offline

    8
    ReputationRep:
    Looks like I'll finish the paper before most people on here. I'll be panicking about my answers till the rest of you come on here. I'll finish the paper at 2:15
    Offline

    16
    ReputationRep:
    The integration trace is the number above the peak right?

    Posted from TSR Mobile
    Offline

    16
    ReputationRep:
    TMS - calibrate the spectra with reference peak at 0 ppm

    D2O - solvent to remove hydrogen from N-H, O-H by allowing them undergo proton exchange to remove them from spectra

    CDCl3 - solvent for compound about to undergo analysis

    Wrong or right?

    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    What does the 6moldm-3 HCl for 24 hours, heating under reflux do?
    Offline

    2
    ReputationRep:
    (Original post by KB_97)
    Looks like I'll finish the paper before most people on here. I'll be panicking about my answers till the rest of you come on here. I'll finish the paper at 2:15
    mine starts at 2
    Offline

    3
    ReputationRep:
    (Original post by L'Evil Wolf)
    What does the 6moldm-3 HCl for 24 hours, heating under reflux do?
    hydrolyses peptides with NH3+ s and COOH s.
    Offline

    2
    ReputationRep:
    http://us20.chatzy.com/27882973356288
    ANYONE WHO FANCIES Some last minute quickfire stuff
    please join
    Offline

    3
    ReputationRep:
    (Original post by AqsaMx)
    What examples would you give for N and P?
    15 for N, 31 for P. um maybe not P would be ask then. also 19 for F.
    Offline

    7
    ReputationRep:
    Does anyone have the OCR breadth in chemistry specimen paper link like the one that we did for mocks that OCR send the teachers??
    Offline

    3
    ReputationRep:
    (Original post by Walkerz7)
    Does anyone have the OCR breadth in chemistry specimen paper link like the one that we did for mocks that OCR send the teachers??
    http://www.ocr.org.uk/Images/171751-...-materials.pdf
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.