Which one of the following statements is incorrect ?

Options 1–3 are factually correct. Goa was separated from Daman and Diu and made a State by the Goa, Daman and Diu Reorganisation Act, 1987 (statehood conferred in 1987) [1]. Diu is located primarily on an island at the southern tip of the Kathiawar Peninsula and is situated on the Gulf of Khambhat (Cambay) [2]. The Constitution (56th Amendment) Act, 1987, conferred statehood on Goa and formed the separate Union Territory of Daman and Diu. Statement 4 is incorrect: Dadra and Nagar Haveli were under Portuguese—not French—rule and were liberated from Portuguese control in 1954 [3].

Sources

1. [1] Introduction to the Constitution of India, D. D. Basu (26th ed.). > Chapter 14: The State Legislature > New States added since 1950 > p. 294
2. [2] https://www.britannica.com/place/Dadra-and-Nagar-Haveli-and-Daman-and-Diu
3. [3] https://ddd.gov.in/introduction/