When determining the identity of your unknown neutral product, you analysed it by IR. What feature(s) on your IR spectrum could help you distinguish piperonal from stilbene? Question 9 options: presence of sp2 C-H stretch near 2850 cm-1 presence of C=O stretch near 1700 cm-1 presence of C-O stretch near 1100 cm-1 more than one of the above

When determining the identity of your unknown neutral product, you analysed it by IR. What feature(s) on your IR spectrum could help you distinguish piperonal from stilbene? Question 9 options: presence of sp2 C-H stretch near 2850 cm-1 presence of C=O stretch near 1700 cm-1 presence of C-O stretch near 1100 cm-1 more than one of the above

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter31: An Oxidation–reduction Scheme: Borneol, Camphor, Isoborneol

Section: Chapter Questions

Problem 5Q

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Identify the frequency of both carbonyl stretches in your IR. Which one corresponds to the benzyl ester? Wavenumber (cm-1) Bond Vibration Shape Intensity Functional Group 3288.63 cm-1 N-H Stretch Sharp Weak Amine/Amide 3078.39 cm-1 C-H Stretch Sharp Weak Aromatic/Alkene 2976.16 cm-1 C-H Stretch Sharp Weak Alkane 1720.50 cm-1 C=O Stretch Sharp Medium Ester 1653.00 cm-1 C=O Stretch Sharp Medium Amide 1556.55 cm-1 C=C Stretch Sharp Medium Aromatic
100 80- 60- 40- 20- 0- 4000 3500 3000 2500 2000 1500 1000 Wavenumber (cm) What information may be revealed from the IR spectrum shown below? (You may need to select more than one option) A) It has alcohol functional group B) The compound has sp3-s sigma bonds C) The compound has sp2-s sigma bonds D) The compound has sp-s sigma bond E) The compound has a carbonyl group % Transmi ttance
values : Experimental values of IR Peaks compared to literature values for Benzoic Acid (ATR method) Bond Stretch Functional group Experimental Peak(cm-1) Literature Peak(cm-1) O-H Carboxylic acid 2800 3200-2200 C=O Carboxylic Acid 1674.9 1677.5 C=C (ring) Aromatic stretch 1579.5 1581-1418.5 C-H Aromatic Sp2 3100 C-O stretch 1285.5 O-H Alcohol 929.89 table 3: Experimental values of IR peaks compared to literature values for 2-Naphthol Bond Stretch Functional group Experimental Peak(cm-1) Literature Peak(cm-1) O-H Alcohol 3219.1 3400-3080 C-C Aromatic (ring) stretch 1507.6 C=C Aromatic stretch 1597.7 1627.3-1377.8 C-H Aromatic Sp2 3050 C-O Secondary alcohol stretch 1168.9 IR results used to prove that the compounds are effectively separated. Discuss on bothdiagnostic peaks and fingerprint region.
When determining the identity of your unknown neutral product, you analysed it by IR. What feature(s) on your IR spectrum could help you distinguish piperonal from stilbene? options: presence of sp2 C-H stretch near 2850 cm-1 presence of C=O stretch near 1700 cm-1 presence of C=C stretch near 1500 cm-1 more than one of the above
2.) How many 'H-NMR and 13C-NMR resonance signals would you expect in each spectrum for 2-aminophenyl phenyl sulfide? NH2 4 3 1 HR20DED0672NS ppm Assign. Shift(ppm) H H N 7.447 7.22 7.21 7.10 A H-c 7.09 6.77 6.75 4.27 H- HA H-E Peaks B and C overlapped to the solvent peak. The solvent peak was not deleted fron this spectrum. H
100 80- 60- 40- 20. 0. 4000 3500 3000 2500 2000 1500 1000 Wavenumber (cm) What information may be revealed from the IR spectrum shown below? (You may need to select more than one option) A) The compound has sp2-s & bond B) The compound has sp3-s 8 bond C) The compound has sp-s sigma bond D) The compound has a functional group of amine. E) The compound has a carbonyl group F) The compound has a functional group of alcohol. G) The compound has a functional group of carboxylic acid 8
Attempt to rank the following compounds in order of decreasing carbonyl stretching frequency. In other words, rank the compound you think will have the highest carbonyl frequency as "1". CH3 Но benzaldehyde acetophenone benzoic acid HO. Но NH2 benzamide N-methylbenzamide salicylic acid 01 moiteoa ethyl benzoate benzoic anhydride CF3 2,2,2-trifluoroacetophenone benzophenone 6.
In an IR spectrum, the C-0 stretch for an alcohol (ROH) or an ether (ROR) appears near 1050 cm¯1, but for a carboxylic acid (RCO,H) or an ester (RCO,R), the C-0 stretch appears near 1250 cm-1. Explain why. -1050 cm-1 -1050 cm-1 -1250 cm-1 -1250 cm-1 R R R R
16 What can you tell me about the following molecule based on the IR spectrum? 20es 3000 Wrenurber tom D 2000 3000 Range (cm) 2850-3000 Functional Class Alkanes Alkenes 3020-3100 (CH & =CH2) 1630-1680 & 1900-2000 (C=C) Alkynes 3300 (C-H) 2100-2250 (CC) 3030 (C-H) 1600 & 1500 (C-C ring) 3200-3650, broad (O-H) 3400-3500 (N-H, 1°amines) 3300-3400 (N-H, 2°amines) Arenes Alcohols Amines Aldehydes & Ketones 2690-2840 (aldehyde C-H) 1720-1740 (CHO, aldehyde) 1710-1720 (C=0, ketone) 2500-3300, broad sometimes with extra peaks (0-H) 1705-1720 (CHO) Carboxylic Acids O It contains an alcohol O It contains an alkane O It contains an amine O It contains an alkyne
The mass spectrum for acetophenone is shown below. a) Where does the molecular ion show up? ?) b) Which peak is the base peak? ? 1) The mass spectrum for acetophenone is shown below. Relative Intensity 100- 80- 20- acetophenone 0-tyttim 20 10 30 40 50 60 77 trommlilily 70 m/z 80 90 100 105 Ć 110 120 120 a) Where does the molecular ion show up? (m/z = ?) b) Which peak is the base peak? (m/z = ?) c) Draw the structure of the charged species responsible for the peak at m/z = 120. d) Draw the structure of the charged species responsible for the peak at m/z = 105. e) Draw the structure of the charged species responsible for the peak at m/z = 77.
Identify peaks in the 1H spectrum that correspond to the t-butyl group, the phenyl groups, and the proton that is α-to the carbonyl. Peak Expected Observed A: Chemical Shift 6.0-8.5 ppm (aromatic) 7.38 ppm A: Splitting Multiplet Multiplet A: Integration 5H 5H B: Chemical Shift 6.0-8.5 ppm (aromatic) 6.85 ppm B: Splitting Multiplet Multiplet B: Integration 5H 5H C: Chemical Shift 5.0-9.0 ppm (amide) 6.19 ppm C: Splitting Singlet Singlet C: Integration 1H 1H D: Chemical Shift 1.0-5.0 ppm (amino) 5.52 ppm D: Splitting Multiplet Multiplet D: Integration 1H 1H E: Chemical Shift 1.4-1.8 (alkyl) 1.33 ppm E: Splitting Singlet Singlet E: Integration 3H 3H
What functional groups are shown in the IR spectrum shown below? LDD D 4000 3000 2000 1500 1000 SDO NAVENUMB ERI -1l O None of the choices are correct. O carboxylic acid ester alcohol O ketone O nitrile (i.e., RCN) O aldehyde TRANSMITTANCEI2