Q1 : It is suggested that IR spectroscopy can be used to show that an alcohol ha

Question

Q1 : It is suggested that IR spectroscopy can be used to show that an alcohol has been oxidised to a ketone by comparing the IR spectra of the alcohol and its oxidation product. Which of the following statements is true and How?

1. 1. the alcohol has been oxidised to a ketone if the broad O%u2013H absorption at about 3300 cm%u22121 in the alcohol spectrum is replaced by a narrow C=O absorption at about 1700 cm%u22121 in the product spectrum

2. 2. the alcohol has been oxidised to a ketone if the narrow O%u2013H absorption at 3300 cm%u22121 in the alcohol spectrum is replaced by a broad C=O absorption at about 1700 cm%u22121 in the product spectrum

3. 3. you cannot tell whether the alcohol has been oxidised to a ketone because these compounds do not absorb in the IR part of the spectrum

4. 4. you cannot tell whether the alcohol has been oxidised to a ketone because both ketones and aldehydes give an IR absorption at around 1700 cm%u22121

Explanation / Answer

1. the alcohol has been oxidised to a ketone if the broad O%u2013H absorption at about 3300 cm%u22121 in the alcohol spectrum is replaced by a narrow C=O absorption at about 1700 cm%u22121 in the product spectrum

the alcohol is secondary alcohol as the question is suggesting, therefore it is giving ketone and not aldehyde. oh used to give broad and co used to give sharp narropw peak around 1700 cm-1, so no 1 option is correct.

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