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Flashcards in Mass Spectrometry Deck (5)
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1

Alcohols

Has no molecular ion peak because the molecular ion readily fragments and usually doesn't reach the collector to record the fragment's molecular mass.

2

Ketones

Has an intense molecular ion peak. Breaks homolytically at the C-C bond and heterolytically at the C-O bond.

3

Alkyl Halides

The C-Br bond is most apt to break (heterolytically) because it is the weakest.

4

Bond Dissociation Energy

C-Br = 71 kcal/mol
C-Cl = 85 kcal/mol
C-C = 89 kcal/mol
C-H = 99 kcal/mol

5

Ethers

The C-O bond is cleaved heterolytically while the C-C bond is cleaved homolytically. The most stable radical will want to form.