He last held the position of Union Minister of Petroleum, during which he died due to cancer.

In 1980, he won the parliamentary elections with an overwhelming majority from Banka (Lok Sabha constituency).

[5] It was established in 1983 by the state government to preserve the antiquities of the surrounding areas.

Though he contested Lok Sabha elections in 1977 as congressman, due to Janata waive he couldn't make it.

He was later inducted into cabinet for various ministries such as Revenue, Industry, Minor Irrigation, Law and Public works.

Chandrashekhar Singh was a part of the famous Young Turks of Bihar Congress during the independence movement along with Bindeshwari Dubey, Bhagwat Jha Azad, Abdul Gafoor, Satyendra Narayan Sinha, Kedar Pandey all future chief ministers and Sitaram Kesri, future national president of Indian National Congress.