To identify the unknown compound X, we will analyze the given mass spectral data and propose a molecular structure based on the observed peaks.1. Molecular ion peak M+ at m/z 112: This peak represents the molecular weight of the compound X. Therefore, the molecular formula of compound X should have a total mass of 112 atomic mass units amu .2. Base peak at m/z 91: This is the most abundant peak in the mass spectrum, which indicates the most stable fragment ion formed after the loss of a neutral fragment from the molecular ion.3. Characteristic fragment peaks at m/z 73 and m/z 57: These peaks represent other significant fragment ions formed during the mass spectrometry process.Now, let's try to deduce the molecular structure of compound X:Since the molecular ion peak is at m/z 112, we can consider the molecular formula to be C8H8O 112 amu = 8 12 + 8 1 + 16 . This formula suggests that compound X is likely an aromatic compound with an oxygen atom.The base peak at m/z 91 suggests that the compound lost a neutral fragment with a mass of 21 amu 112 - 91 . This loss could be due to the cleavage of a CH3 group and a hydrogen atom 15 + 1 + 1 = 21 . This indicates that compound X might have a CH3 group attached to the aromatic ring.Considering the fragment peaks at m/z 73 and m/z 57, we can deduce that the compound lost additional neutral fragments with masses of 39 amu 112 - 73 and 55 amu 112 - 57 . These losses could be due to the cleavage of a C3H3 group 39 amu and a C4H3O group 55 amu , respectively.Based on the above analysis, we can propose the molecular structure of compound X to be 2-methylphenol o-cresol : OH |C6H4 - CH3This structure has a molecular formula of C7H8O 108 amu and fits the given mass spectral data. The presence of an aromatic ring, a hydroxyl group, and a methyl group explains the observed fragment peaks and the base peak in the mass spectrum.