The Congress accepted the Mountbatten plan because:
(i) The Communal riots had taken a serious turn as a result of the Muslim League. Partition of the country seemed to offer a new way out of chaos and anarchy.
(ii) The League had joined the Interim Government to obstruct and not co-operate. Experience of working with the League had convinced Patel and others that it could not have a joint administration with the League.
(iii) The only alternative to partition was a Federation with a weak Centre. A smaller India with a strong central authority was better than a bigger state with a weak centre.