This is a matching question from the NCERT textbook Chapter 2 'Era of One-Party Dominance'. The correct matches are: S. A. Dange was a prominent leader of the Communist Party of India; Shyama Prasad Mukherjee founded the Bharatiya Jana Sangh in 1951; Minoo Masani was one of the founders of the Swatantra Party which advocated for economy free from State control; and Asoka Mehta was associated with the Praja Socialist Party. The context mentions Shyama Prasad Mukherjee as an opposition leader in the interim government, and references to the Socialist Party and other opposition parties are made in the chapter.