Which of the following bonds tend to have the most intense signal in an IR spectrum.Select answer from the options belowCsp2—H C=C C ≡≡ CC=O
Question
Which of the following bonds tend to have the most intense signal in an IR spectrum.Select answer from the options belowCsp2—H C=C C ≡≡ CC=O
Solution
The bond that tends to have the most intense signal in an IR spectrum is C=O.
Here's why:
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The intensity of an IR signal depends on the change in dipole moment that occurs during a vibration. The greater the change in dipole moment, the more intense the signal.
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C=O bonds have a significant difference in electronegativity between the carbon and oxygen atoms, leading to a large dipole moment.
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In contrast, Csp2—H, C=C, and C≡≡C bonds have less of a difference in electronegativity between the bonded atoms, resulting in smaller dipole moments.
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Therefore, C=O bonds tend to produce the most intense signals in an IR spectrum.
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