% Transmittance 50 (a) Compound A 100 What functional groups are responsible for the absorptions above 1500 cm¹ in compounds A and B? при 100 (b) Compound B % Transmittance 50 0 0 4000 3500 3000 2500 2000 1500 1000 500 4000 3500 Wavenumber (cm-1) 3000 2500 2000 1500 1000 Wavenumber (cm¹) 500 a. Compound A has two major absorptions above 1500 cm-1: The absorption at ~3000 cm¹ is due to C-H bonds and the absorption at -1700 cm¹ is due to a C=O group. b. Compound B has two major absorptions above 1500 cm: The absorption at -3000 cm¹ is due to C-H bonds and the absorption at -2250 cm is due to a triple bond, either a C=C or a C=N. Because there is no absorption due to an sp hybridized C-H bond at 3300 cm, this IR spectrum cannot be due to a terminal alkyne (HC=CR) but may still be due to an internal alkyne. 49

% Transmittance 50 (a) Compound A 100 What functional groups are responsible for the absorptions above 1500 cm¹ in compounds A and B? при 100 (b) Compound B % Transmittance 50 0 0 4000 3500 3000 2500 2000 1500 1000 500 4000 3500 Wavenumber (cm-1) 3000 2500 2000 1500 1000 Wavenumber (cm¹) 500 a. Compound A has two major absorptions above 1500 cm-1: The absorption at ~3000 cm¹ is due to C-H bonds and the absorption at -1700 cm¹ is due to a C=O group. b. Compound B has two major absorptions above 1500 cm: The absorption at -3000 cm¹ is due to C-H bonds and the absorption at -2250 cm is due to a triple bond, either a C=C or a C=N. Because there is no absorption due to an sp hybridized C-H bond at 3300 cm, this IR spectrum cannot be due to a terminal alkyne (HC=CR) but may still be due to an internal alkyne. 49

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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