How can IR spectroscopy distinguish between a ketone and an aldehyde? An aldehyd
ID: 1010819 • Letter: H
Question
How can IR spectroscopy distinguish between a ketone and an aldehyde?
An aldehyde would show absorption bands around 2820 and 2720 cm-1 and a ketone would not have these absorption bands.
A ketone would show absorption bands around 2820 and 2720 cm-1 and an aldehyde would not have these absorption bands.
Since both compounds contain a carbonyl group, the IR spectra would be identical.
More information is needed.
a.An aldehyde would show absorption bands around 2820 and 2720 cm-1 and a ketone would not have these absorption bands.
b.A ketone would show absorption bands around 2820 and 2720 cm-1 and an aldehyde would not have these absorption bands.
c.Since both compounds contain a carbonyl group, the IR spectra would be identical.
d.More information is needed.
Explanation / Answer
An aldehyde will show absorption bands at around 2820 and 2720 cm-1, due to the C-H bonds. These bonds are not present in ketone, so ketone will not show this bands. However both will show peaks at around 1600 cm-1 due to C-O double bonds. So, the peak at 1600 cm-1 will not help in distinguishing between aldehyde and ketone. The absorption peak around 2820 and 2720 cm-1 will help in telling that it is an aldehyde and not ketone. Answer is a.
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