Match the IR spectrum to one of the following three compounds: Match the IR spectrum to…
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Question “Match the IR spectrum to one of the following three compounds: Match the IR spectrum to…”
Match the IR spectrum to one of the following three
compounds:
Answer
Answer 1
2-methy -1-octene An ALKENE
Butyl methylether An ETHER
1-Pentanol An ALCOHOL
Answer 2
To determine the functional groups in a compound, infrared spectroscopy can be used. Infrared bands are observed when the dipole moment between atoms changes. Infrared band describes the bond stretching caused by the dipole moment in the molecule.
Infrared spectroscopy
At certain absorption frequencies, infrared bands are visible.
\begin{array}{l}\\{\rm{wave}}\,{\rm{number}}\,\left( {{\rm{or}}} \right)\,{\rm{absorbance}}\,\,{\rm{is}}\,\,{\rm{\nu }}\\\\{\rm{\nu }}\,{\rm{ = }}\,\frac{{\rm{1}}}{{{\rm{2\pi c}}}}\sqrt {\frac{{\rm{k}}}{{\rm{\mu }}}} \\\\{\rm{where}}\\\\{\rm{\mu = }}\,{\rm{reduced}}\,{\rm{mass}}\\\\{\rm{c }}\,{\rm{ = }}\,{\rm{speed}}\,{\rm{of}}\,{\rm{light}}\\\\{\rm{k = }}\,{\rm{spring}}\,{\rm{constnt}}\,{\rm{of}}\,{\rm{the}}\,{\rm{bond}}\\\end{array}Reduction in mass $math_tag_1
Given compound
2-methyl-1-octene
This is an unsaturated hydrocarbon that belongs to the alkene \left( {{\rm{C = C}}} \right)
The functional group in the compound is “ene”.
IR range $math_tag_3
1-pentanol
This compound is part of the alcohol category.
The molecule contains an alcohol $math_tag_4 functional group.
IR range $math_tag_5
Butyl methylether
This compound is part of the ether category.
The molecule contains ether $math_tag_6 functional group
IR range $math_tag_7
Given the IR spectrum
This IR spectrum clearly shows that the spectrum merges only with Butyl methyl ether. The spectrum shows a sharp peak at $math_tag_8
There are no sharp peaks in either the range of carbon -carbon double bonds or alcohol functional groups.
This spectrum refers to Butyl methylether compound.
Ans:
Conclusion
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