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how do you find the functional groups for this IR spectrum result? this is for my...

how do you find the functional groups for this IR spectrum result? this is for my organic chemistry lab.
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Answer #1

the peak you write at 1642 cm-1 is not for Alkene its for the carbonyl (CO) group because if its C=C there is a stretch at around 3040-3050 cm-1 which is for =C-H stretch. so, the functional group present is CO group.
peak at 2969 cm-1 is correct its for the C-H stretch.
region below 1500 cm-1 is for the fingerprint region.
most important peak is the peak for CO group.

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