Figure 3-7 100 IT A 60 0. 100 1 0 4800 100 80 3000 W тари B 1000 20 0 4000 IR2017-91129TM 3000 2000 60 %T w 40 3000 NAVEG 2008 BAYE NUMBERI 1100 2000 1500 1500 Wavenumber [cm-¹] 1000 300 1000 100 400
![Figure 3-7
100
IT
A
60
0.
100
1
0
4800
100
%T
80
60
40
20
0
4000
IR2017-91129TM
3000
3000
3000
2000
B
NAVEG
2008
Jappy
BAYE NUMBERI
1100
2000
1500
1500
Wavenumber [cm-¹]
1000
1000
300
1000
100
400](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F34a9c4cb-86d3-4919-ad5f-37407f4c9cd7%2F6d15a4a6-5029-4ee9-8211-e3614336b45a%2Fil1gyn8_processed.png&w=3840&q=75)
![See Figure 3-7.
Spectrum A has the functional group
Spectrum B has the functional grou
Spectrum C has the functional grou
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alkene
ketone
carboxylic acid
terminal alkyne
aldehyde
alcohol
A](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F34a9c4cb-86d3-4919-ad5f-37407f4c9cd7%2F6d15a4a6-5029-4ee9-8211-e3614336b45a%2F37nb3eo_processed.png&w=3840&q=75)
The IR spectrum is used for the confirmation or detection of functional groups present in the molecule. The functional groups are detected with the help of the absorption of the IR radiation by the different types of bond due to which they vibrates and rise a peak or band. The major functional groups of the molecule give peaks or band greater than 1500 cm-1.
Bond type wavenumber
O-H 3600 - 3300 cm-1
C-H (alkyl) 3000 - 2800 cm-1
C-H (alkyne) approx at 3300 cm-1
C-H (aldehyde) pair of weak band at 2860 - 2700 cm-1
C=O 1740 - 1680 cm-1
C=C 1660 - 1600 cm-1
Alkyne (carbon triple bond ) 2150 cm-1
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