Answer : 1. "इलाहबाद"
Explanation :

In January 1923, Chittaranjan Das, Narsingh Chintaman Kelkar and Motilal Nehru Bithalbhai Patel established a party named 'Congress-Khilafat Swarajya Party' in Allahabad, of which Chittaranjan Das was made its president and Motilal was made its secretary.