<Li> The constitution was adopted, with a committee of experts led by the Congress Party (known as the Congress Assembly Party) played a pivotal role . </Li> <Ul> <Li> 9 December 1946: The first meeting of the Constituent Assembly was held in the constitution hall (now the Central Hall of Parliament House). Demanding a separate state, the Muslim League boycotted the meeting . Sachchidananda Sinha was elected temporary president of the assembly, in accordance with French practice . </Li> <Li> 11 December 1946: Rajendra Prasad was elected as president and H.C. Mukherjee was elected as vice-president of the constituent assembly . B.N. Rau was appointed as its constitutional adviser . </Li> <Li> 13 December 1946: An' Objective Resolution' was moved by Jawaharlal Nehru in the assembly, laying down the underlying principles of the constitution . It finally became the Preamble of the constitution . </Li> <Li> 22 January 1947: Objective resolution unanimously adopted . </Li> <Li> 22 July 1947: National flag adopted . </Li> <Li> 15 August 1947: Indian independence achieved as the Dominion of India . </Li> <Li> 29 August 1947: Drafting Committee appointed with Dr. B.R. Ambedkar as the Chairman . </Li> <Li> 16 July 1948: Along with Harendra Coomar Mookerjee V.T. Krishnamachari was also elected as second vice-president of Constituent Assembly . </Li> <Li> 26 November 1949: Constitution passed and accepted by the assembly . </Li> <Li> 24 January 1950: "Jana Gana Mana" adopted as the national anthem, with the first two verses of "Vande Mataram" the national song . Rajendra Prasad elected the first president of India . </Li> </Ul> <Li> 9 December 1946: The first meeting of the Constituent Assembly was held in the constitution hall (now the Central Hall of Parliament House). Demanding a separate state, the Muslim League boycotted the meeting . Sachchidananda Sinha was elected temporary president of the assembly, in accordance with French practice . </Li> <Li> 11 December 1946: Rajendra Prasad was elected as president and H.C. Mukherjee was elected as vice-president of the constituent assembly . B.N. Rau was appointed as its constitutional adviser . </Li>

Who acted as the provisional president of the constituent assembly