% 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

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% 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
Transcribed Image Text:% 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
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