Question

Which compound is this?
Choices: p-Hydroxybenzoic acid, Hydrocinnamic acid, or p-Methoxyphenol

C-Cis a medium-weak absorption near 1650 em medium to strong absorptions near 1600 and 1475 em- often imply an aromatening confirm the above by checking the C reion: aromatic and vinyl CH occurs >> 3000 cm . while aliphatie CH occurs 3000 cm! Triple bonds CN is a medium sharp absorption near 2250 cm! h ut chamahention arm C lity, and thicknes) each type of polyo E Part at 1925.88 Liquid so 3418 - 2368 e % Transmittance - 2982.10 52.81 2831.17 2663.37 2546.44 547.13 3386.02 1509.61 930.43 1101.66 770.04 1607.49 1594.37 1291.22 854.91 1242.82 1168.56 1128.15 1675.00 1447.12 1419.55 1316.57 618.87 -10 4000 2000 1000 3000 Wavenumbers (cm-1)

Answer 1

The IR spectra mentioned above is related with p-Hydroxybenzoic acid. In which

3386 is related with -OH stretching (intermolecular bonded)

3052 is related with carboxylic acid -OH stretching.

2982 is related with alkene -CH stretching.

2831 is related with -OH stretching.

2546 is related with -CH bending (aromatic).

1925 is related with C=O stretching (carboxylic acid).

1665 is related with C=C alkene stretching (benzene)

1447 is related with -OH bending (carboxylic acid).