Final answer:
Title to the wrong appliances shipped by Lace Corp. revests to Lace upon their rejection by Parco because the rejection signifies that the goods did not conform to the contract terms.
Step-by-step explanation:
When Lace Corp. inadvertently shipped the wrong appliances to Parco Inc. and Parco rejected them, title to the goods would revest to Lace when they are rejected by Parco.
The shipping terms 'FOB -- Parco's warehouse' indicate that the seller, Lace, would bear the risk of loss during transportation until the goods reached Parco's warehouse. However, since the goods shipped were not as specified in the contract, Parco has a right to reject them. Upon rejection, the risk of loss and title would typically revert to the seller, Lace Corp., unless the contract states otherwise.