Step 1: Understanding the Concept:
The Constituent Assembly of India appointed several committees to deal with different aspects of the Constitution-making process.
These committees were divided into major and minor committees based on their functional importance.
Step 2: Detailed Explanation:
The Union Constitution Committee was one of the major committees of the Constituent Assembly.
Its primary role was to draft the framework for the executive, legislative, and judicial powers of the Union government.
The chairman of this committee was Jawaharlal Nehru.
For clarification on other options:
- B. R. Ambedkar was the Chairman of the most important committee, the Drafting Committee.
- Rajendra Prasad was the Chairman of the Steering Committee and the Rules of Procedure Committee.
- Vallabhbhai Patel was the Chairman of the Provincial Constitution Committee and the Advisory Committee on Fundamental Rights, Minorities, and Tribal and Excluded Areas.
Step 3: Final Answer:
The Chairman of the Union Constitution Committee was Jawaharlal Nehru.