how exactly were we supposed to predict this reaction? (official aamcs guidequestion)

[mrh125]

heating 2-oxocyclohexanecarboxylic acid gives a ketone. how exactly were we supposed to predict that? the mechanism looks familiar but i would have picked it turning into an alkene (I thought of it like heating an aldol condensation product, but it looks more like what happens when you heat a malonic ester or acecoacetate synthesis problem under acidic conditions the conditions arent acidic tho o.0).

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[dudewheresmymd]

B- keto acid decarboxylation