Option 1: This statement is correct. The Cripps Mission was indeed sent to India by the British Government in March 1942.

Option 2: This statement is not correct. The Cripps Mission did not propose that the Constitution of India would be framed by an elected Constituent Assembly of the Indian people. Instead, it proposed the formation of a Constituent Assembly with representatives from the Indian National Congress and the Muslim League, who would then decide on the future Constitution.

Option 3: This statement is correct. The Cripps Mission allowed for any province that was not prepared to accept the Constitution to retain its existing constitutional provisions at that time.

Option 4: This statement is correct. The Cripps Mission allowed the British Government to enter into a separate constitutional arrangement with any province that chose to accede to it.

In conclusion, option 2 is the correct answer as it inaccurately states the proposal made by the Cripps Mission regarding the framing of the Constitution of India.