Final answer:
The reaction of 1-bromobutane with AgNO3 in ethanol produces 1-ethoxybutane via an SN1 mechanism, involving the formation of a carbocation intermediate followed by a nucleophilic attack by ethanol.
Step-by-step explanation:
The primary product formed in the reaction of 1-bromobutane with AgNO3 in ethanol through an SN1 mechanism is 1-ethoxybutane (D). In this reaction, the bromide ion leaves, forming a carbocation intermediate which is then attacked by the ethanol solvent, acting as a nucleophile, to form the ether product, 1-ethoxybutane. The SN1 mechanism is characterized by the first step being unimolecular, involving the formation of the carbocation intermediate, which is then followed by nucleophilic attack.