Which of the following gives rise to a prominent M

Question

Which of the following gives rise to a prominent M - 18 peak in the mass spectrum?

Quizplus · Accepted Answer

The prominent M+18 peak in the mass spectrum is typically attributed to the presence of a hydroxyl group (-OH) or an ether group (-O-) in the compound. Among the given choices, only 1-pentanol contains a hydroxyl group, which accounts for the M+18 peak. The other compounds do not contain any functional groups that would give rise to this peak.