Explanation:

Gandhi-irwin Paact was signed on the 5th March 1931, it laid the ground to Gandhi’s participation in the Second Round Table conference to be held in London.
The First Round table Conference did not have any representative from the Congress, and Gandhiji was in jail due to his participation in Civil Disobedience movement.
The Liberal leaders Tej Bahadur Sapru and Jayakar played an important role in bringing into effect the Gandhi-Irwin pact. Through the parleys of these leaders Gandhiji accepted to suspend the CDM and take part in the Second Round Table Conference and the Viceroy agreed to withdraw the ordinance to curb the congress, further more he agreed to free the political prisoners not charged with acts of Violence.