The correct answer is 1924. Explanation & Key Takeaways: • Hindustan Republican Association was a revolutionary organization formed in 1924. • It was formed by Ram Prasad Bismil and Sachindra Nath Sanyal. • The main leaders of the Hindustan Republican Association are Chandra Shekar Azad, Ram Prasad Bismil, Ashfaq Ullah Khan, Thakur Roshan Singh, Roshan Singh, and Rajendra Lahiri. • The constitution for the Hindustan Republican Association was drafted in 1923 at Allahabad. • It was the first revolutionary movement at the national level against the British. • Kakori conspiracy is associated with the Hindustan Republican Association. • The British captured the leaders of the Hindustan Republican Association for involvement in the Kakori Conspiracy. • Ram Prasad Bismil, Ashfaq Ullah Khan, Roshan Singh, and Rajendra Lahiri were hanged in 1927. • Chandra Shekar Azad shot himself on 27th February 1931. • Hindustan Republican Association was later renamed as Hindustan Socialist Republican Association.