What are the name of the salts formed by ethers?

Oxonium salts

The correct answer is option 1. Oxonium salts.

Oxonium salts are produced when ethers reacts with mineral acids (like HCl, H₂SO₄, etc.). In ethers due to the presence of lone pairs of electron on the oxygen atom, it behaves as a Lewis base and reacts with a strong acid to form protonated oxonium salts. Since, the oxygen atom donates the lone pair of electrons so, the ether is said to be basic in nature.