In the given pairs, the correct matches are as follows:

1. Bharatiya Jana Sangh — Dr. Shyama Prasad Mukherjee is correctly matched, as he was the founder of the party in 1951.

2. Socialist Party — C. Rajagopalachari is incorrect; he was associated with the Indian National Congress, while the Socialist Party was founded by leaders such as Jayaprakash Narayan.

3. Congress for Democracy — Jagjivan Ram is also incorrectly matched, as he did not lead this party, which was formed in 1977, primarily by former Congress members like Raj Narain.

4. Swatantra Party — Acharya Narendra Dev is incorrect; the party was founded by C. Rajagopalachari and others, not Acharya Dev.

Thus, the only correctly matched pair is the first one, making a total of only one correct match in the entire list. This analysis highlights the importance of understanding the historical context of political parties and their founders, a vital aspect in UPSC examinations.