Open Question
Based on IR data given determine the structure of the unknown. Unknown compound C has molecular formula C6H10O3. It shows peaks at 2900, 1850 , 1740 cm-1 and in the fingerprint region.
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15. Analytical Techniques:IR, NMR, Mass Spect
IR Spect:Extra Practice
Multiple Choice
Match the following functional group choices with the supplied infrared spectra data.
A
Ketone
B
Alkyne
C
Alkene
D
Alkyl Halide
E
Amine
Verified step by step guidance1
Examine the infrared spectrum for characteristic peaks. The spectrum shows a strong absorption around 2900 cm-1, which is typical for C-H stretching vibrations found in alkanes.
Look for the presence of a peak around 1700 cm-1, which would indicate a carbonyl group (C=O) typical of ketones. This peak is not present, so we can rule out ketones.
Check for a peak around 2100-2260 cm-1, which would indicate a C≡C triple bond typical of alkynes. This peak is not present, so we can rule out alkynes.
Identify any peaks around 1600-1680 cm-1, which would suggest a C=C double bond typical of alkenes. This peak is not present, so we can rule out alkenes.
Consider the absence of peaks around 3300-3500 cm-1, which would indicate N-H stretching typical of amines. The spectrum lacks these peaks, suggesting the compound is not an amine. The spectrum is consistent with an alkyl halide, which typically does not have strong characteristic peaks in the regions examined.
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