Which of the following modes will give rise to an absorption in the infrared region? Select 3 of the answers below Select one or more: O a. CS stretch of carbon monosulphide. O b. The C-C stretch in acetylene(C2H2). O c. The symmetric CO stretch of CO2 O d. The O-0 stretch in oxygen. O e. The bending mode of water. O f. asymmetric CO stretch in CO2.
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IR spectroscopy is a technique which is used to determine the actual structure of a compound. It helps in the detection of a functional group in any compound. It measures the vibrations of a molecule in the infrared region. The vibrations can be symmetric or asymmetric.
A molecule is IR active when the net dipole moment of a molecule is non-zero while it is IR inactive when the net dipole moment of a molecule is zero.
a.
In CS, there is some electronegativity difference in between the C and S atoms. So, there is a permanent dipole moment in the CS stretching. Therefore, the CS stretch will give rise to infrared absorption in the spectrum.
So, option a is correct.
b.
In C-C, there is no electronegativity difference in between the two C atoms. So, there is no dipole moment in the C-C stretching of ethylene. Therefore, the C-C stretch will not give rise to infrared absorption in the spectrum.
So, option b is incorrect.
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