1. MASS SPECTROSCOPY

2. Identify possible Groups that fit the fragment size in the table.
Group that is suggested 15 17 28 29 43 45 77

3. Mass spec. fragments Fragment size Group that is suggested 15 CH3 17OH 28
C=O or C2H4 29
C2H5 43
COCH3 45
COOH 77
C6H5
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4. Determine the Mr and assign possible group to each fragment.

5. 2. Determine the Mr, assign possible groups to each group and sketch a possible Structural Formula
for the Compound analysed.
(Remember the structure must contain the possible fragment patterns to be valid)
Alkane

7. Alcohol

10. INFRA RED SPECTROSCOPY

11. 1500-4000 Is called the Functional Group Range.
Each Functional Group in an Organic Compound Absorbs IR Radiation of specific Wavelengths. So if we shine Infra-Red Radiation at a sample of the Compound and note which Wavelengths are absorbed we can identify the functional group present. Where is the finger print region found on an Infra-Red Spectra and how can we use this information?
Is called the Functional Group Range.
is called the “Fingerprint” Area and the Spectra is unique to each compound. This area can be matched using a computer to a database of known IR’s to identify the compound.

12. ALKANES CONTAIN JUST THE C-H BOND
Cyclohexane
C–H

13. ALKENES CONTAIN a C-H and a C=C
cyclohexene
C=C
C–H

14. butanal
C–H
C=O

15. ethanol
O–H

16. propanone
C=O

17. ethanoic acid
O-H
C=O
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18. methyl ethanoate
C=O
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19. Match the following eight compounds to the following eight IR spectra.
hex-2-ene
pentane
methylpropan-1-ol
2-methylpentan-3-one
butanal
butanoic acid
propyl ethanoate
nitrobenzene
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20.                 
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21.  propyl ethanoate C=O C-O                
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22.                 
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23.  2-methylpentan-3-one C=O                
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24.                 
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25. 
methylpropan-1-ol
O-H                
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26.                 
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27. 
nitrobenzene
C-H                
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28.                 

29. 
pentane
C-H                
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30.                 
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31. 
butanal
C-H
C=O                
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32.                 
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33. 
butanoic acid
O-H                
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34.                 
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35. 
hex-2-ene
C-H
C-H
C=C                
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36. 2 Hydroxy-propanoic Acid
Sketch possible Mass Spectrums (minimum 3 fragments) and Infra Red Spectrums for the following Organic Compounds showing the main Identifying Functional Groups.
Propan-2-ol
Octanoic Acid
2 Methyl 3 Ethyl Decanal
Methyl Decanoate
2 Hydroxy-butanal
2 Hydroxy-propanoic Acid
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