6. Which of the protons in the following molecule show the highest chemical shift in the 'H NMR spectrum? CH-CH-C-O-CH2-CH3 iv a. i b. ii c. iii d. iv Give detailed Solution with explanation needed. avoid handwritten Solution

204hw1-1 0021.pdf CCOB 124% 1. a) Consider this compound: ch -Br b) How many signals would this compound give in the 'NMR? You may group aromatic hydrogens together as one signal. cture above, label the different types of H'S as In table form, list the peaks, the number of On the st c) А, В, с, etc. hydrogens, their shifts, and the splitting you would observe in the 'NMR spectrum of this compound, for example: # of hydrogens Shift (6) -2.0 splitting singlet Label 3 etc. 23 ?S ? tv

This is the spectrum for cocaine: 100. 60. 40. 20. 0.0 0.0 50. 100. 150. 200. 250. 300. 350. The molecular formula for cocaine is C17H21NO4. The structure is: H. CHs HH C-H H а. What molecule or particle produced the peaks at 303 and 304 amu?

A STK2083_Molecular_Spectroscopy_Group Assignment.pdf - Adobe Acrobat Reader DC File Edit View Sign Window Help Home Tools STK2083_Molecular. x Sign In 1 /1 119% a. Which of the compounds below best matches the following 'H NMR spectrum? Integration values are indicated next to their corresponding signal. 2. Search 'Signature' Convert PDF но Edit PDF A B Comment OH HO Combine Files D E EI Organize Pages 24 16 2 Redact A Compress PDF 16 U Protect 8 D Fill & Sign Create, edit and sign PDF forms & agreements PPM b. Briefly explain your answer 2 (a) based on number of signals, position of signals and the integration of the signals. Start Free Trial

14) The intensity of a signal in a ¹H NMR spectrum is determined by A. The number of neighboring C. Number of enantiotopic B. The electronic environment of D. Number of equivalent E. Number of non-equivalent protons.

OWLV2 | Online teaching and le X D https://cvg.cengagenow.com/ilrm/takeAssignment/takeCovalentActivity.do?locator=Dassignment-take rome YouTube OTranslate Open Vellum Course Home [References] The 'H-NMR of a compound with molecular formula C4H,Br consists of one signal: 1.8 (singlet, integrating to 9 Hydrogens). Propose a structural formula for this compound consistent with this information. • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. C ору aste C.

ing and X PLQ-PHY2054L.docx- Google X G 138 lbs to kg - Google Searc X C Draw The Structure Of The CX engagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator3Dassignment-take ... Translate Open Vellum Course Home [Review Topics] [References] The chemical environment of carbons can be deduced form their chemical shifts. Deduce the relative chemical shifts of the carbons at the labeled positions. (Carbons that are highly shielded have low delta, chemical shift, values.) 1) NH2 C The carbon with the smallest delta value (the most shielded) is The carbon with the largest delta value (the most deshielded) is 2) b с осн The carbon with the smallest delta value (the most shielded) is The carbon with the largest delta value (the most deshielded) is

(c) techniques? Draw the COSY spectra for H3C-CH2-CH,-C-OCH, CH3 How is 2D NMR affected by FT- to depict the correlations expected.

4. Below are the IR regions and NMR chemical shifts table for use with the spectroscopy problems: 'H NMR 12 R O=C 11 OH 10 9 ΟΞΟ R-C-H 1---- - 00 8 Nitrogen-15 Oxygen-16 Nitrogen-14 7 Phosphorus-31 Sodium-23 Carbon-13 ppm 6 H C=C-H OH 5 NH H-C-X H-C-O -OH X = F, Cl, Br (i.e. electronegative atom) 3 -NH Which of the following isotopes is NOT NMR active? 2 H-C-N H-C-S 1 -CH3 -CH₂- CEC-H H-C-C=O -CH H-C-C=C HC-0 0 4000 DID small range range of values broad peak =C-H 3250- 3300 N-H broad with spikes -3300 3500 -O-H broad-3300 -3400 -O-H -CIN CO N-H H H 2730- 2820 -C-H of =C H 3000- 2 peaks 3100 2850- 2960 H O -C-O-H broad-3000 3000 usually strong -CEN 2200 -CICH ⇓ 2200 2500 wavenumber, cm-¹ 2000 C HC N H 1600- 1660 980 1680 AU OR 1730 O 1710 3 1600 NR₂ 1650 1500 1000 -1.

The structure of a molecule is shown below. The fluorines are diastereotopic. F. CM23 Me CI Br i) Sketch the H NMR spectrum of the molecule. You must annotate your spectra with "Jxy notation and suggest approximate chemical shifts. ii) Sketch the 19F NMR spectrum of the molecule. You must annotate your spectra with "Jxy notation.