Select the IR spectrum that corresponds best to 3-hydroxy-2-butanone. (See the Hint for the structure.) Key…
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Question “Select the IR spectrum that corresponds best to 3-hydroxy-2-butanone. (See the Hint for the structure.) Key…”
Select the IR spectrum that corresponds best to
3-hydroxy-2-butanone. (See the Hint for the structure.) Key
absorptions are marked on the spectra.
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.
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 wavenumber. Different functional groups can then be identified in the IR spectra by using wave numbers.
![Functional group
Range
of
absorption (cm-1)
2850–2975
3400—3600
1640–1680
3020_3100
2100–2250
3300
2200–2250
Alkane (C-H)
Alc](https://drive.google.com/uc?id=1GWRM1PktNXS4SaLbOaMLDDJhXsWta3w0&export=download/Select-the-IR-spectrum-that-corresponds-best-to-3-hydroxy-2-butanone.-(See-the-Hint-for-the-structure.)-Key.png?x-oss-process=image/resize,w_560/format,webp)
Draw the 3-hydroxy-2-butanone structure as shown below.
![ОН
3-hydroxy-2-butanone](https://drive.google.com/uc?id=137GQiyQT4y7RnxriAKABC_PwvaXkvDum&export=download/Select-the-IR-spectrum-that-corresponds-best-to-3-hydroxy-2-butanone.-(See-the-Hint-for-the-structure.)-Key.png?x-oss-process=image/resize,w_560/format,webp)
Identify the IR range of the functional group in the compound, as shown below.
![→ Shows the IR absorption at 1750-1680 cm?
ОН
→ Shows the IR absorption at 3200-3600 cm](https://drive.google.com/uc?id=1GVpOOHlor8tNK92P62ed2j09Frffuu6w&export=download/Select-the-IR-spectrum-that-corresponds-best-to-3-hydroxy-2-butanone.-(See-the-Hint-for-the-structure.)-Key.png?x-oss-process=image/resize,w_560/format,webp)
Third spectrum showing the peak at 3530\,{\rm{c}}{{\rm{m}}^{ - 1}}Ans
The third spectrum shows the IR absorption at {\bf{3530}}\,{\bf{c}}{{\bf{m}}^{{\bf{ - 1}}}}
Conclusion
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