AQA A2 Chemistry C32 Structure Determination Kerboodle Answers

This page contains the AQA A2 Structure Determination  Questions and kerboodle answers for revision and understanding .This page also contains the link to the notes and video for the revision of this topic.
 
Banner 1

C32.1 Nuclear magnetic resonance (NMR) spectroscopy AQA A2 Chemistry C32 Structure Determination: Page No. 231

1 a A single peak b Both carbon atoms are in exactly the same environment. 2 The upper one is propan-1-ol, as it three peaks because all three carbon atoms arc in difrerent environments. The lower one is propan-2-ol, as it has two peaks because there arc carbon atoms in just two different environments.

32.2 Proton NMR AQA A2 Chemistry C32 Structure Determination : Page No. 233

1 a Isomers have the same molecular formula but different arrangements of atoms in space. b c i propan-1-ol 4 ii propan-2-ol? 3 d i propan-1-ol A3;B2;C2; D1 ii propan-2-ol? A6; B1; C1 e i Propan-1-ol D>C>B>A ii propan-2-ol. C>B>A

32.3 Interpreting proton, IH, NMR spectra AQA A2 Chemistry C32 Structure Determination : Page No. 239

1
A is ethanol, B is methoxymethane. b A: 4.5 is R-O-H, 3.7 is R-CH2-0-, 1.2 is R-CH3 B 3.3 is -O-CH3 c A: 4.5, I; 3.7, 2; 1.2, 3. B: It is not possible to tell. 2 There is no spin-spin coupling because the two CH3 groups are not on adjacent carbon atoms. Banner 2

Practice questions: Page No. 240-241

1 (a)  (i) CDCl3 or CD2Cl2 or C6D6 or CCl4 (ii) 4 (iiiTriplet (iv) 1,4-dichloro-2,2-dimethylbutane  (b) (i) (ii) 190–220 cm-1 (iii) Hexane-2,5-dione 2 (a) J (acid) amide K (secondary) amine or amino (b) (δ = ) 3.1–3.9 doublet OR duplet (c (i) Solvent must be proton-free OR CHCl3 has protons or has H or gives a peak (ii) CDCl3 is polar OR CCl4 is non-polar (d) 11 OR eleven (e) (i) Si(CH3)4 OR SiC4H12 (ii) a single number or a range within 21-25 (iii) (f) (i) NaBH4 (ii) (iii) (Plane) polarised light OR light in a polarimeter Polarised light is not rotated or is unaffected (iv) Advantages
  • Cheaper medicine due to cost or difficulty of separation or both can lower blood pressure
  • OR more effective/beneficial with a reason
Disadvantages
  • May be side effects from one enantiomer in the mixture
  • OR only half the product works or one enantiomer may be ineffective
  • OR double dose required
Banner 3

DISCLAIMER

Disclaimer: I have tried by level best to provide the answers and video explanations to the best of my knowledge. All the answers and notes are written by me and if there is any similarity in the content then it is purely coincidental. But this is not an alternative to the textbook. You should cover the specification or the textbook thoroughly. This is the quick revision to help you cover the gist of everything. In case you spot any errors then do let us know and we will rectify it. References: BBC Bitesize AQA GCSE Science Kerboodle textbook Wikipedia Wikimedia Commons Join Our Free Facebook Group : Get A* in GCSE and A LEVEL Science and Maths by Mahima Laroyia: https://www.facebook.com/groups/expertguidance.co.uk/ For Free Tips, advice and Maths and Science Help