H nmr Samenvattingen, Aantekeningen en Examens

Interpretation of UV, NMR, IR, and Mass Spec. Data – Part 4 Question 1 Identify the unknown compound from the given data: The compound has only 70.5%C, 13.7%H, and 15.6%O.

IR Spectra correct answer: -Absorption of radiation causes vibrational excitation of functional groups *making it easy to ID functional groups* *0-5000cm-1* H NMR Spectra correct answer: *0-12ppm* C NMR Spectra correct answer: *0-200ppm* Mass Spec correct answer: -Used to measure the molecular weight (mass) of the compound. Alkyne Reactions correct answer: *1* Alkyne + H2/Pd &C = Alkene *2* Alkyne + H2/Lindlav Cat.= Cis Alkene *3* Alkyne + Li or Na/Liquid NH3= Trans Alkene ...

Mass spectrometry correct answer: Technique that sorts ions based on their mass to charge ratio Electron ionization correct answer: -Also known as hard ionization -Very energetic, produces fragments ("daughter ions") Electrospray ionization correct answer: -Also known as soft ionization -Species remains intact, form ions by attaching H+ (+1 amu) or Na+ (+23 amu) 3:1 correct answer: Mass spectrometry ratio that appears for Cl 1:1 correct answer: Mass spectrometry ratio that a...

What is an alkene and its general formula? It is an unsaturated hydrocarbon with a least one C=C bond. General formula is CnH2n What is a sigma bond? σ single covalent bond formed when two s orbitals overlap. High electron density What is a pi bond? sideways overlap of p orbitals that occur in a double or triple bond. Much weaker than sigma, low bond enthalpy and lower electrostatic attraction Is an alkane or an alkene more reactive? Alkene. contains both sigma and pi bonds with high ele...

For a second year Imperial College student studying Biochemistry Content is detailed & extensive. Content includes: - Mass spectrometry (pros/cons, parts, mass spec data, ionisation sources, mass analysers and their performance characteristics, TOF analysers, hybrid instrument) - Peptide sequencing (ES-MS/MS, etc.) - Interpreting MS Spectra - Proteomics - Post translational modifications (features, effects, types, etc.) - Catalytic antibodies/ Abzymes (including Cocaine case study) -...

best to prepare m-choroaniline from benzene? HNO2/H2SO4; Cl2/AlCl3; SN/HCl; HO- best to prepare p-chlorotoluene in high yield? start with p-aminotoluene; NaNO2/HCl, 0C; CuCl best to prepare m-dibromobenzene from benzene? nitrate; brominate; Sn/HCl; NaNO2; 0 C; CuBr electrophilic aromatic substitution Nitro ? N Group, Nitrogen M-director, destabilized META, less than ortho, para electrophilic aromatic substitution -NHCOCH3 ? Activator, o-p director reaction with Bromine substituent ? Br...

CHEM 14C Winter 12 Final Exam Part B Solutions 1. HO O O 2. Influence #1: Resonance causes some or the entire molecule to be planar. Influence #2: Resonance increases stability. Influence #3: Resonance causes electron delocalization. 3. Coplanar The carboxylic acid and ring B have this geometry because it allows for conjugation between the C=O and the B ring aromatic electron cloud. H 4. 5. Ten 6. A, B, and C 7. Of the carbon stereocent...

3300 (IR) - ANSWERO-H (IR) 3200 (IR) - ANSWERN-H (IR) 3100 (IR) - ANSWERC-H Aromatic (IR) 3000 (IR) - ANSWERC-H Vinyl (IR) 2950 (IR) - ANSWERC-H Alkyl (IR) 2250 (IR) - ANSWERCN (IR) 1720 (IR) - ANSWERCO (IR) 1680 (IR) - ANSWERC double bond N (IR) 1640 (IR) - ANSWERC double bond C (IR) 1600 (IR) - ANSWERC double bond C Aromatic (IR) 1550 (IR) - ANSWERN double bond O (IR) 10-12 (NMR) - ANSWER 9-10 (NMR) - ANSWER 6-8 (NMR) - ANSWERAromatic H 4-6 (NMR) - ANS...

OCR AS LEVEL CHEMISTRY A H432/03 UNIFIED CHEMISTRY ACTUAL 2024 EXAM GENUINE EXAM WITH ACCURATE ANSWERS. CHECK THE LAST PAGE FOR ACCURATE ANSWERS 1 This question is about organic chemistry. (a) This part is about two practical techniques used in organic preparations. (i) Complete the missing labels on the diagram and name the technique. Heat Name of technique: [2] (ii) Draw a labelled diagram to show apparatus set up for filtration under reduced pressure (vacuum filtration)...

OCR 2023 Chemistry A H432/02: Synthesis and analytical techniques A Level Question Paper & Mark Scheme (Merged) Please Review and leave your Rating stars…. Please write clearly in black ink. Do not write in the barcodes. Centre number Candidate number First name(s) Last name Oxford Cambridge and RSA Monday 19 June 2023 – Afternoon A Level Chemistry A H432/02 Synthesis and analytical techniques Time allowed: 2 hours 15 minutes INSTRUCTIONS • Use black ink. You can use a...