Which of the following is not a form of divorce under Muslim Law?

Iddat is a waiting period following dissolution of marriage or the husband’s death, not a form of divorce, so "Idda" is the answer. Hasan, khula and talaq-ul-biddat are names used in the traditional divorce taxonomy, although talaq-e-biddat was invalidated by the Supreme Court in 2017 and is declared void and illegal by section 3 of the Muslim Women (Protection of Rights on Marriage) Act, 2019.

Current law: Within Uttarakhand UCC scope the Code provides the governing divorce framework, subject to exclusions and section 390 savings.