Assertion :HCl→H++Cl− is an ionization. Reason: The electron is initially shared between both atoms, thus the dissociation event into ions involves the transfer of an electron from one atom to the other.
Dissociation is a general process in which molecules (or ionic compounds such as salts, or complexes) separate or split into smaller particles such as atoms, ions or radicals, usually in a reversible manner.
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions. It does not split like in dissociation reaction.
Hence, both the statement are true and reason is correct explanation for assertion.