## Identification of Monosubstituted Alkyl Benzene using IR SpectroscopyThe following IR spectra (A, B, C, and D) represent different arenes. The task is to determine which one likely belongs to a monosubstituted alkyl benzene. ### Analysis of Spectra#### Spectrum A- Peaks: - 3028 cm^-1 (aromatic C-H stretch) - 2920 cm^-1 (alkyl C-H stretch) - 1605, 1496, 1451 cm^-1 (aromatic C=C stretches) - 1379 cm^-1 (CH3 deformation) - 729, 696 cm^-1 (out-of-plane aromatic C-H bending)#### Spectrum B- Peaks: - 3061, 2961 cm^-1 (aromatic and alkyl C-H stretches) - 1601, 1590 cm^-1 (aromatic C=C stretches) - 1473 cm^-1 (C-H bend) - 1071 cm^-1 (C-O stretch) - 770, 681 cm^-1 (out-of-plane aromatic C-H bending) - 400 cm^-1 (unknown)#### Spectrum C- Peaks: - 3061, 2962 cm^-1 (aromatic and alkyl C-H stretches) - 1597 cm^-1 (aromatic C=C stretches) - 1481 cm^-1 (C-H bend) - 1031 cm^-1 (C-O stretch) - 745 cm^-1 (out-of-plane aromatic C-H bending) - 430 cm^-1 (unknown)#### Spectrum D- Peaks: - 3081, 2961 cm^-1 (aromatic and alkyl C-H stretches) - 1614 cm^-1 (aromatic C=C stretches) - 1487 cm^-1, others (C-H bend) - 801 cm^-1 (out-of-plane aromatic C-H bending) - 478 cm^-1 (unknown)### Identifying Monosubstituted Alkyl Benzene**Monosubstituted alkyl benzenes** typically show:- Aromatic C-H stretching around 3030 cm^-1- Alkyl C-H stretching around 2920 cm^-1-

IR peaks determines the functional group availability on the compound. The functional groups are…

7a. All of the following IR spectra are from arenes, but which one is likely from a monosubstituted alkyl benzene? (Circle the letter A, B, C, D; and see below.) Assign the "aryl" bands in your choice. 3000 1379 2920 1451 1605 A 3028 1496 696 729 4000 3000 2008 1000 VENUERI 3061 400 2961 B 1601 1590 1473 681 1071 770 4000 3000 eoce J000 DOST 00 2962 3061 430 1597 1481 1031 1 745 3000 2000 1000 RVENUMBERI 1614 3081 2961 D 50

7a. All of the following IR spectra are from arenes, but which one is likely from a monosubstituted alkyl benzene? (Circle the letter A, B, C, D; and see below.) Assign the "aryl" bands in your choice. 3000 1379 2920 1451 1605 A 3028 1496 696 729 4000 3000 2008 1000 VENUERI 3061 400 2961 B 1601 1590 1473 681 1071 770 4000 3000 eoce J000 DOST 00 2962 3061 430 1597 1481 1031 1 745 3000 2000 1000 RVENUMBERI 1614 3081 2961 D 50

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter23: Addition To A Carbonyl

Section: Chapter Questions

Problem 8E

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A
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