Prominent peaks in the IR spectrum are sufficient to distinguish between which compounds?
I. diethyl ether and diethylamine
II. cyclohexanone and cyclopentanone
III. pentanal and pentanol
IV. 2-hexene and 3-hexene

Question

Quizplus · Accepted Answer

I, III: Diethyl ether and diethylamine can be distinguished by their IR spectra due to the presence of a strong N-H bond absorption in amines that ethers lack. Pentanal (an aldehyde) and pentanol (an alcohol) can also be distinguished by their IR spectra, as aldehydes show a strong C=O stretch and alcohols show a broad O-H stretch. Cyclohexanone and cyclopentanone both have C=O stretches, making them harder to distinguish solely by this feature. 2-Hexene and 3-Hexene are both alkenes and would have similar C=C stretch frequencies, making them difficult to distinguish by IR alone.

Prominent Peaks in the IR Spectrum Are Sufficient to Distinguish