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In my textbook it says that when reacted with PCC, primary alcohols produce an aldehyde. Why is this example different? I do not see any double bonds.
The product shown is an aldehyde. If you count the number of bonds to the carbon with oxygen attached, you can see one single bond to the carbon on the ring, one bond to the hydrogen and therefore there must be two bonds to oxygen - a double bond.
Required, but never shown