Molecular Formula: C 3 H 6 O 2 Mass Spectrum Data: UV-VIS Data: Molecular Ion (M
ID: 1022192 • Letter: M
Question
Molecular Formula: C3H6O2
Mass Spectrum Data: UV-VIS Data:
Molecular Ion (M+) 74 m/z No significant UV absorption > 220 nm.
Fragment 43 m/z (base peak)
Answer the following questions.
11. What is the degree of unsaturation for this compound?
a. 0
b. 1
c. 2
d. 3
12. The peak at 1746 cm-1 on the IR spectrum tells us the compound contains a(n)
a. hydroxyl group
b. primary amine
c. carbonyl group
d. aromatic ring
13. The sharp intense peak at 1246 cm-1 is usually indicative of _____________ stretch.
a. carbon-carbon single bond
b. carbon-nitrogen single bond
c. carbon-hydrogen single bond
d. carbon-oxygen single bond
14. Based on the information from the IR spectrum, the major functional group in this compound is a(n) _____________.
a. alcohol
b. carboxylic acid
c. ester
d. aldehyde
15. Based on the 1H NMR how many sets of non-equivalent protons are in this molecule?
a. 1
b. 2
c. 3
d. 4
16. The most deshielded peak in the 13C NMR is characteristic of the ______________ group.
a. vinyl carbon
b. sp-hybridized carbon atoms
c. carbonyl carbon atom
d. aromatic carbon atoms
17. The base peak at m/z 43 in the mass spectrum is due to the loss of ___________ group.
a. OCH3
b. C=O group
c. CH3 group
d. O=CCH3
18. The peak at 3.4 ppm in the 1H NMR is more downfield than the peak at 2.0 ppm because it is attached to _______________.
a. another carbon atom
b. an oxygen atom
c. more hydrogen atoms
d. more carbon atoms
19. The molecular ion peak at m/z 74 tells us the ______________ of the compound.
a. molecular formula
b. melting point
c. molecular weight
d. empirical formula
20. The name and structure of the compound that best fits this data is
Explanation / Answer
11) b ) 1
12 ) c.) carbonyl group
13) d.) carbon-oxygen single bond
14) c) . ester
15) b. 2
16) c. carbonyl carbon atom
17) d. O=CCH3
18) b. an oxygen atom
19) c. molecular weight
20) CH3COOCH3 , name methyethanoate
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