2) For the spectra labeled 1-4: Each spectrum corresponds to one of the followin
ID: 716108 • Letter: 2
Question
2) For the spectra labeled 1-4: Each spectrum corresponds to one of the following related functional groups: aldehydeketone carboxylic acid ester amide ether Draw these functional groups in the space below each name. Then, match the functional group structures to the spectra labeled 1-4. Two functional groups will not be used. As above, label each bond stretch that you can identify on the spectrum with its corresponding bond type In addition to the stretches for the specific functional group you assign, label any C-H stretches (sp3, sp2, sp, or aldehyde) and any C-C stretches that you find. One of these spectra contains an alkene- make sure you have labeled it!Explanation / Answer
1. It contains ketone (-CO) group. The peak at 1710 cm-1 is due to C=O streching. Peak at 2900 cm-1 is due to sp3 C-H streching.
It contains alkene. The peak at 3000 cm-1 is due to alkene (sp2C-H) streching. The peak at 1600 cm-1 is due to alkene (C=C) streching.
2. It contains amide (-CONH2) group. Two separate peaks at 3200 and 3300 cm-1 are due to N-H streching.
3. It contains carboxylic acid (-COOH) group. The broadened peak at 3200 cm-1 is due to the streching of O-H bond of the -COOH group. The peak at 1700 cm-1 is due to C=O streching of the carboxylic acid group.
4. It contains aldehyde (-CHO) group. The peak at 1710 cm-1 is due to C=O streching. Two medium peaks at 2700 and 2800 cm-1 are due to =C-H streching.
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