For each of the following pairs of compounds, name one absorption band that could be used to distinguish between them. CH3CH2OH and CH3CH2NH2

Question

Jesse Lutz

Chemistry

2 November, 07:51

For each of the following pairs of compounds, name one absorption band that could be used to distinguish between them. CH3CH2OH and CH3CH2NH2

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Answers (1)

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Cullen Chambers · Answer 1

For CH3CH2OH the OH stretch between 3550-3200 cm-1

For CH3CH2NH2 a pair of bands at 3500 and 3400 cm-1 respectively corresponding to the N-H stretch

Explanation:

CH3CH2OH is ethanol. This is a primary alcohol characterized by the by the - OH (hydroxyl) group. A strong broad IR absorption in the 3550 - 3200 cm-1 corresponds to the O-H stretch and indicates that the compound could be an alcohol or it has an OH functional group.

CH3CH2NH2 is ethylamine. This is a primary amine characterized by the - NH2 (amino) group. The presence of a primary amine shows up as a pair of medium strength absorption features corresponding to the N-H stretch, one at around 3500 cm-1 and the other around 3400 cm-1.