How do you identify the compound with IR spectrum with a molecular formula #C_5H_8O#?

Question

Zoe Alexander · Accepted Answer

The simple answer is YOU CAN'T.

#C_5H_8O# has 2 degrees of unsaturation. Each degree of unsaturation corresponds to a double bond or a ring. Could you draw ALL the isomers of #C_5H_8O# (there would be a dozen or so), and compare these to the known IR spectra of these isomers? It is possible, but it is much easier to make a few derivatives of your unknown species, and compare these melting points to melting points of the known derivatives.

Ruby Allen · Answer

undefined To identify the compound with an IR spectrum and a molecular formula of C5H8O, you would first analyze the IR spectrum for characteristic peaks that correspond to functional groups present in the compound. Common functional groups in organic compounds include alcohols, carbonyls, and double bonds. Based on the molecular formula C5H8O, potential functional groups could include alkenes, ketones, aldehydes, ethers, and alcohols. By comparing the observed peaks in the IR spectrum to known frequencies associated with these functional groups, you can determine the most likely functional groups present in the compound and narrow down the possible structures. Additional spectroscopic techniques, such as NMR spectroscopy, can further aid in the structural elucidation of the compound.