Chemistry Exam > Chemistry Questions > Which of the following statements is wrong.a)...
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Which of the following statements is wrong.
- a)The wavenumber of a band in an IR spectrum is proportional to the frequency of the associated molecular vibration.
- b)Water is a good solvent for recording UV spectra of water-soluble compounds.
- c)Water is a good solvent for recording IR spectra of water-soluble compounds.
- d)Hydrogen bonding in hydroxy compounds leads to broadening of spectral bands attributable to O-H stretching vibrations.
Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements is wrong.a)The wavenumber of a band ...
Understanding the Incorrect Statement: Option C
Water is often considered a polar solvent, making it suitable for dissolving a variety of polar substances. However, its properties pose challenges for recording IR spectra.
Why Water is Not a Good Solvent for IR Spectra:
- **IR Absorption in Water:**
- Water has strong IR absorption bands, particularly in the regions where many functional groups of organic compounds absorb.
- This leads to a high background signal, which can obscure the spectral features of the solute.
- **Dilution Effects:**
- When water-soluble compounds are dissolved in water, their concentration may be too low to generate clear IR signals, making it difficult to interpret the spectrum.
Comparison with UV Spectroscopy:
- **UV Transparency:**
- In contrast, water is transparent in the UV region, allowing for effective recording of UV spectra for water-soluble compounds.
- **Minimal Interference:**
- The absence of significant UV absorption by water ensures that the spectra reflect the properties of the solute without interference.
Conclusion:
Thus, while water is an excellent solvent for dissolving many compounds, it is unsuitable for recording IR spectra due to its own strong absorbance in the IR range. This makes option 'C' the incorrect statement among the given options.
Water is often considered a polar solvent, making it suitable for dissolving a variety of polar substances. However, its properties pose challenges for recording IR spectra.
Why Water is Not a Good Solvent for IR Spectra:
- **IR Absorption in Water:**
- Water has strong IR absorption bands, particularly in the regions where many functional groups of organic compounds absorb.
- This leads to a high background signal, which can obscure the spectral features of the solute.
- **Dilution Effects:**
- When water-soluble compounds are dissolved in water, their concentration may be too low to generate clear IR signals, making it difficult to interpret the spectrum.
Comparison with UV Spectroscopy:
- **UV Transparency:**
- In contrast, water is transparent in the UV region, allowing for effective recording of UV spectra for water-soluble compounds.
- **Minimal Interference:**
- The absence of significant UV absorption by water ensures that the spectra reflect the properties of the solute without interference.
Conclusion:
Thus, while water is an excellent solvent for dissolving many compounds, it is unsuitable for recording IR spectra due to its own strong absorbance in the IR range. This makes option 'C' the incorrect statement among the given options.
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Which of the following statements is wrong.a)The wavenumber of a band in an IR spectrum is proportional to the frequency of the associated molecular vibration.b)Water is a good solvent for recording UV spectra of water-soluble compounds.c)Water is a good solvent for recording IR spectra of water-soluble compounds.d)Hydrogen bonding in hydroxy compounds leads to broadening of spectral bands attributable to O-H stretching vibrations.Correct answer is option 'C'. Can you explain this answer?
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