Which of these two isomers, cyclopentane or 1pentene, is this the IR spectra of

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Which of these two isomers, cyclopentane or
1-pentene, is this the IR spectra of?

1650 cm-1
3000 cm-1
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What IR peaks would you expect for the two
molecules with the formula C2H6O?
Ethanol
Dimethyl ether
-OH 3200 - 3600 cm-1 -CH 3000 cm-1
-CH 3000 cm-1
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IR spectra of ethanol. The spectra of dimethyl
ether would look similar minus the large OH
stretch.
3000 cm-1
3200 - 3600 cm-1
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Which of the three compounds below matches the IR
spectra?
3000 cm-1
1650 - 1800 cm-1
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Using the mass and IR spectra, determine the
identity of the compound containing only C, H and
O?
58
100
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Determine the of Cs. 100/12 8 Cs
8 x 12 96 100 96 4 So C8H4
DOUS7
We know there is at least one oxygen so subtract
a CH4 group. C7O DOUS8 also not a likely
formula
So get rid of 1 C and add 12 Hs C6H12O DOUS1
looks much better
Now add one more O for more possibilities. C5H8O2
DOUS2
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C6H12O
C5H8O2
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1650-1800 cm-1
1650 cm-1
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CNH2N2
12
CNH2N2
CNH2N
CNH2N-2
C3H4
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(2(3)2-5-1)/21
(2(4)2-71)/22
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4
7
7
4
7
2
3
26
3
2
4
4
3
10
5
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