Spectroscopy of Ketones and Aldehydes: vibration stretching for cyclobutanone Pa

Question

Spectroscopy of Ketones and Aldehydes: vibration stretching for cyclobutanone Part A The molecular structure and IR spectrum of cyclobutanone are given in the followin figures. Match the peak wavenumbers given below to their corresponding stretches (if the peak corresponds to an unlisted vibration, select "none").

2900-3000 cm^1 [1,2,3].

1740 cm^1 [4,5,6].

1400 cm^1 [7,8,9]

1090 cm^1 [10,11,12].

POSSIBLE ANSWERS:

1) C=O stretch 2) C-H stretch 3) none 4) C=O stretch 5) C-H stretch 6) none 7) C=O stretch 8) C-H stretch 9) none 10) C=O stretch 11) C-H stretch 12) none

Explanation / Answer

2900-3000 cm^1 = 2) C-H stretch
1740 cm^1 = 4) C=O stretch
1400 cm^1 = 8) C-H stretch
1090 cm^1 = 12) none

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