Analysis of multiple spectra to determine an unknown structure
A very quick solution to this problem before my train stop.

Mass Spec gives MW of 122.

1H spectrum gives 5 aromatic, a 1H quartet at 4.8ppm, a 1H exchangeable proton at 2.4ppm and 3H doublet at 1.5ppm. The 4.8/1.5 splitting indicates a substituted ethyl chain with the C1 group having two substituents (CHRR'-CH3). The chemical shift of this 4.8ppm proton indicates some substantial substitution, such as a heteroatom. We also have a labile 1H, which could come from an alcohol or an amine.

13C spectrum shows monosubstituted benzene ring (4 carbon environments with ipso carbon downfield shifted). Also shows two alkyl carbons corresponding to the ethyl chain we have worked out above.

To summarise data to date:


1 monosubstituted benzene (C6H5)
1 ethyl chain, doubly substituted on C1 (CH-CH3)


That gives us a molecular formula of C8H9 which adds up to 105. That leaves 17...... which includes one labile proton, leaving a mass of 16.

As this is clearly a homework question, I'll leave you to join the pieces.