Discussion
Consider the following pairs of neutral loss and its identity.
15 - Methyl
18 - Water
28 - Carbon monoxide
31 - Hydroxyl
How many of the pairs given above are correctly matched?
Answer: D
The first three are correct and the fourth is not, so three match. A loss of thirty-one is a methoxy group, characteristic of methyl esters and ethers; hydroxyl is seventeen. A short table of common losses accounts for most of what a spectrum shows, and reading differences between peaks rather than their absolute masses is what makes the table usable.
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