Click on any numbered peak for help in interpreting this spectrum.
The peak occurs at m/e = 45, and it is the base peak in this spectrum (the most intense peak). The molecular weight, m/e = 45, is a common fragment seen in alcohols (loss of an alkyl group to form R=COH.+, where R = CH3).
The peak occurs at m/e = 45, making this peak m-17 (commonly, loss of an -OH group).
The peak occurs at m/e = 73, making this peak m-15 (loss of a methyl group).
The peak occurs at m/e = 87, making this peak m-1 (loss of a hydrogen). Loss of a m/e = 1 is often seen in compounds with acidic hydrogens.
The peak occurs at m/e = 88, which is the molecular weight of the compound, making this the molecular ion (m.+).
C5H12O MW = 88.15
From the molecular formula, the compound has "no degrees of unsaturation" (no double bonds, carbonyls or rings).
IUPAC Name: 2-pentanol
MS Fragments:
The spectrum shows a small molecular ion and a small peak resulting from loss of a hydrogen atom from the alcohol. Loss of a methyl group gives the m-15 peak and loss of hydroxy radical gives the secondary carbocation at m-17. The base peak, not surprisingly, is formed by expulsion of the alkyl chain to give the simple oxonium ion at m/e = 45.
The spectrum shows a small molecular ion and a small m-1 peak, suggesting the presence of an alcohol (it cannot be an aldehyde since there are no degrees of unsaturation). The m-15 peak represents loss of a methyl group and the m-17 is consistent with loss of a hydroxy radical. For an alcohol, the base peak is often formed by expulsion of an alkyl chain to give the simple oxonium ion R'CR''=OH+; to generate the observed m/e = 45, R' must be CH3 and R' a H.
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Structure: 
