Explanation:

The Constitution of India was drafted by a Constitution Assembly established under the Cabinet Mission Plan of 1946. The establishment of the constituent assembly took place on December 6, 1946.The Union Constituent Assembly, responsible for drafting the Constitution of India, formed several committees to facilitate the constitution-making process. These committees were entrusted with specific tasks and played crucial roles in shaping various aspects of the constitution. 

Among these committees, eight were considered major committees, while the rest were categorized as minor committees.
The names of the major committees and their chairmen are:

• Union Powers Committee - Jawaharlal Nehru .
• Union Constitution Committee - Jawaharlal Nehru .
• Provincial Constitution Committee - Sardar Patel .
• Drafting Committee - Dr B.R. Ambedkar .
• Advisory Committee on Fundamental Rights, Minorities and Tribal and Excluded Areas - Sardar Patel .
• Rules of Procedure Committee - Dr Rajendra Prasad .
• States Committee (Committee for Negotiating with States) - Jawaharlal Nehru .
• Steering Committee - Dr Rajendra Prasad .
• Order of business committee – K.M. Munshi
• (Hence all pairs are correctly matched)