- Molecular ion peak is very weak.
- M-1 peak is good diagnostic peak, even for long chain Aldehyde.
- In lower aldehydes, α-cleavage is prominent with retention of charge on oxygen.
- In straight chain Aldehydes, the other diagnostic peaks are at
- M-18 because loss of water
- M-28 because loss of ethylene
- M-43 because loss of CH2=CH-O
- M-44 because loss of CH2=CH-OH
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