It is possible to chargeback Paypal as a gift or not.
I also need to know this.
POSSIBLE , by saying un-authorized payment

Like what? An hacked account?
That's easy for them to check the ip.
And it's easy for you to change your IP.
There are a dozen different ways for PayPal gift to get chargebacked. It's not any safer (and possibly less safe, actually) than PayPal goods & services.