Which of the following is not a ground of divorce under the Dissolution of Muslim Marriages Act, 1939 ?

Section 2 of the Dissolution of Muslim Marriages Act, 1939 allows divorce where, among other grounds, the husband's whereabouts have not been known for four years, he has failed to maintain her for two years, or he "was impotent at the time of the marriage and continues to be so". The imprisonment ground in clause (iii) applies only where he "has been sentenced to imprisonment for a period of seven years or upwards".

Imprisonment for two years is therefore not a ground; the two-year period belongs to the maintenance ground.