The statement that is NOT correct about Jaipal Singh is option 4. He did not campaign for a separate state of Chhattisgarh.

Option 1 states that Jaipal Singh was a member of the Constituent Assembly. This is correct. Jaipal Singh was indeed a member of the Constituent Assembly of India, which was responsible for drafting the Constitution of India.

Option 2 states that Jaipal Singh founded the Adivasi Maha Sabha. This is also correct. Jaipal Singh was a prominent leader of the Adivasi community and played a crucial role in forming the Adivasi Maha Sabha, an organization that aimed to fight for the rights and welfare of the tribal communities in India.

Option 3 states that Jaipal Singh was the captain of the first Indian national hockey team. This is correct as well. Jaipal Singh was a talented hockey player and had the honor of captaining the Indian hockey team in the 1928 Olympics, where India won its first Olympic gold medal.

Therefore, the only incorrect statement is option 4. Jaipal Singh did not campaign for a separate state of Chhattisgarh.