4. An IR spectrum has the following Potentially important absorptions: 3091, 306

Question

4. An IR spectrum has the following Potentially important absorptions: 3091, 3067, 2963, 2921, 2252, 1603, 1499, 1455, 1416, 1078, 1031, 941, 735, 696 cm^ - 1. Indicate which Structure Corresponds to the IR data. - 1 point 5. The base peak in a mass spectrum corresponds to the most stable fragment. Propose a structure for a compound composed of C, H and O atoms. The molecular ion m/z = 116; base peak is at m/z = 59. The IR spectrum shows a strong absorbance at 3257 cm^ - 1 - 1 point 6. Which C - C bond would most likely break and give fragments in the mass spectrum of butyl benzene? 1 point

Explanation / Answer

4. From the above data, it is clear that it is the structure of compound D, benzyl cyanide.

Peak at 3050-3000 shows C-H strecthing absorption in aromatic hydrocarbon

1650-1450 show C=C str and 900-700 show C-H def vibration

peak at 2250 show CN str in case of benzonitriles

All these data proves that structure is of benzyl cyanide as peak for OH comes at above 3300 and for carbonyl group C=o, it comes at 1750 which are absent in the given data.

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