What functional group or groups might absorb the infrared radiation described? A

Question

What functional group or groups might absorb the infrared radiation described? A susbstance displays a strong, broad band in its IR spectrum at about 3350 cm -1, boiling point of 97.5 C, density of about 0.80 g m L and refractive index of 1.39 compound best fits is 1-propanol. What functional group or groups might absorb the infrared radiation described? A susbstance displays a strong, broad band in its IR spectrum at about 3350 cm -1, boiling point of 97.5 C, density of about 0.80 g m L and refractive index of 1.39 compound best fits is 1-propanol. A susbstance displays a strong, broad band in its IR spectrum at about 3350 cm -1, boiling point of 97.5 C, density of about 0.80 g m L and refractive index of 1.39 compound best fits is 1-propanol.

Explanation / Answer

The structure of the 1-propanol is as follows

CH3-CH2-CH2-OH.

It shows the following IR absorption peaks

The peak at ~2960 cm-1 is due to alkane C-H

The peak at 1130 cm-1 is due to C-O bond

And the broad peak at 3200-3600 cm-1 is due the -OH group.

Therefore alcohol (-OH) functional group absorb the IR radiation at about 3350 cm-1

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