Explanation:

- Option 1: C Rajagopalachari was a prominent Indian politician but not associated with the founding of the All India Trade Union Congress (AITUC).

- Option 2: Lala Lajpat Rai was indeed the first President of the All India Trade Union Congress when it was founded in 1920. He was a noted freedom fighter and leader.

- Option 3: Chandra Shekhar Azad was a revolutionary freedom fighter in India but had no direct association with AITUC.

- Option 4: Motilal Nehru was a significant political leader but not related to the founding of AITUC.