Which compound matches the IR spectrum? 1-hexen-3-ol 1-methylcyclopentene 3-hexanol 1.5-hoxadiene cylohexane trans-4-octene dipropyl ether Which compound…
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Question “Which compound matches the IR spectrum? 1-hexen-3-ol 1-methylcyclopentene 3-hexanol 1.5-hoxadiene cylohexane trans-4-octene dipropyl ether Which compound…”
Answer
The IR spectrum analyzes the interaction between a molecule and infrared radiation. IR spectra can be used to identify different functional groups in a compound.
Infrared spectroscopy
At certain absorption frequencies, infrared bands are visible.

The function group determines the reduction in mass and spring constant for a bond. Higher frequency ranges are associated with stronger bonds with lighter atoms. Different functional groups give absorption bands at different intensities and ranges in IR. Knowing the absorption range allows you to predict the functional groups present in a given molecule. Below is a table that shows the IR absorption for common functional groups.
Because their bonds are polar, these groups absorb IR radiation. This causes the bonds to vibrate at a specific wavenumber. Different functional groups can then be identified in the IR spectra by using wave numbers.
Functional group | ![]() |
![]() | 2800-2900 |
![]() | 3400-3600 |
![]() ![]() | 1640-1680 3020-3100 |
![]() ![]() | 2100-2250 3300 |
![]() | 2200-2250 |
Aromatics | 1650-2000 |
![]() | 3300-335 |
![]() ![]() ![]() ![]() ![]() | 1720-1690 1750-1680 1750-1735 1780-1710 |
Two bands are included in the IR spectrum.
Peak at HTMLmedia_tag_15$ signifies the Alkyl HTMLmedia_tag_16$ bond, and peak at HTMLmedia_tag_17$ signifies the alkyl HTMLmedia_tag_18$ bonds.


while another peak is at #media_tag_21$





Peak


Peaks

Three peaks can be found in the cyclohexane at


Trans -4-octene has two functional groups that is alkene






The wrong options include 3-hexanol and 1-hexen-3 ol, dipropyl and 1-methylcylcopente.

Cyclohexane can be used.
Two bands are found in an IR spectrum.
Peak at 2900-2800cm -1 indicates Alkyl

bond and peak at 1100cm -1 indicates

bond.

Three peaks can be found in the cyclohexane at Media_tag_42$


.


, and another peak at @media_tag_47$


Peaks


Peak

Trans -4-octene has two functional groups that is alkene







The wrong options include cyclohexane ,1hexen-3-ol 1,5-hexadiene and 3-hexanol.

Dipropylether is the best option.
The given IR spectrum contains broad peak at

which indicates the

group

indicates the

stretch of

, and

indicates the

stretch.



Three peaks can be found in the cyclohexane at Media_tag_71$


Peaks

Trans -4-octene has two functional groups that is alkene






Peak






The wrong options include dipropylether, cyclohexane ,1,5hexadiene and trans-4-octene.

1-hexan-3 ol is the best option.
Ans:



Conclusion
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