Sir Cyril Radcliffe was not a member of the Cabinet Mission.

The Cabinet Mission was a delegation of three British Cabinet ministers - Sir Stafford Cripps, AV Alexander, and Pathick Lawrence - who arrived in India in March 1946 with the objective of finding a solution to the constitutional deadlock between the Indian National Congress and the Muslim League.

Below are the details of the members of the Cabinet Mission and their roles:

1. Sir Stafford Cripps:
- Sir Stafford Cripps was a prominent British politician and a member of the Labour Party.
- He was the head of the Cabinet Mission and played a crucial role in formulating the proposals for Indian independence.
- Cripps was known for his Cripps Mission in 1942, which aimed to secure Indian support for the British war effort during World War II.

2. AV Alexander:
- AV Alexander, also known as Viscount Alexander of Tunis, was a senior British military officer and statesman.
- He served as the Minister of Defence in the British government during World War II.
- As a member of the Cabinet Mission, Alexander provided valuable insights into the military and security aspects of the proposed constitutional arrangements for India.

3. Pathick Lawrence:
- Pathick Lawrence, also known as Baron Lawrence of Kingsgate, was a British politician and member of the Labour Party.
- He held various important positions in the British government, including the Secretary of State for India.
- Lawrence played a key role in the Cabinet Mission and was responsible for negotiating with Indian political leaders to find a consensus on the future of India.

4. Sir Cyril Radcliffe:
- Sir Cyril Radcliffe was a British lawyer and a member of the Radcliffe Commission, which was tasked with drawing the boundary lines between India and Pakistan.
- Although Radcliffe's partition plan was crucial in the eventual division of British India into India and Pakistan, he was not a member of the Cabinet Mission.

In conclusion, Sir Cyril Radcliffe was not a member of the Cabinet Mission. The Cabinet Mission consisted of Sir Stafford Cripps, AV Alexander, and Pathick Lawrence, who played significant roles in formulating proposals for Indian independence and finding a constitutional solution for the country.