Where I can check the serial?
How to check original product of Apple like iPhone Adapter.
Recently I bought an adapter from local area. How to identify for is it original or duplicate?
iPhone 11 Pro, iOS 16
If by "adapter" you are referring to an Apple power adapter for your iPhone, then having its serial number will not help you identify it as an original Apple product.
The bottom line is if you purchased it directly from Apple or an Apple Authorized Reseller, then it would be an original, otherwise, it could be a fake.