Question

4: Which of the following compounds is consistent with an
infrared spectrum showing: a broad absorption band at
3000 cm1 with some sharper bands appearing on its
shoulder at about 2930 cm1; a strong absorption at about
1700 cm1; a sharp band at 1500 cm1; a series of sharp
bands between 650 and 800 cm1?
2547272653
CH3CO2H
C6H5CO2H
C6H5OH
C2H5OH​

Answer 1

The correct answer is C₆H₅O₂H which is consistent with an infrared spectrum showing the bands at the given positions.

• 3000cm⁻¹ ⇒ O-H

• 2930cm⁻¹ ⇒ C-H

• 1700cm⁻¹  ⇒ C=O

• 1500cm⁻¹  ⇒ C=C

• The '% transmittance' vertical axis shows how much light was absorbed at each frequency.
• The values of percent transmittance for each wavelength that passed through the sample are represented by the solid line.
• 100% transmittance at the high end of the axis indicates that there was no absorption at that frequency.
• Lower transmittance percentages indicate that the compound is absorbing some of the energy, which causes downward spikes in the IR spectrum are referred to as absorption bands.
• Since a molecule has numerous covalent bonds, each of which has a unique vibration mode, a compound's IR spectra typically exhibits various absorption bands.

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