Which one of the following pairs is not correctly matched?

Option 4 is not correctly matched. Andhra Pradesh was created initially as Andhra State in 1953 and its territory was further adjusted under the States Reorganisation provisions in 1956 [1]. The Part C State of Bilaspur was merged with Himachal Pradesh by the Himachal Pradesh and Bilaspur (New State) Act, 1954 [2]. Gujarat was formed by dividing the State of Bombay under the Bombay Reorganisation Act, 1960, and official records list Gujarat’s year of formation as 1960, not 1996 [4]. The Treaty of Yandabo (Yandabu) of 1826 transferred several territories from Burma to British India, including areas that became part of Assam, so option 2 is correctly matched (no conflicting source citation required here).

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 16: India–Political Aspects > Smaller States of India > p. 17
2. [2] Introduction to the Constitution of India, D. D. Basu (26th ed.). > Chapter 6: TERRITORY OF THE UNION > Formation of new States and Alteration of Boundaries, etc. > p. 78
3. [3] Introduction to the Constitution of India, D. D. Basu (26th ed.). > Chapter 6: TERRITORY OF THE UNION > Formation of new States and Alteration of Boundaries, etc. > p. 79
4. [4] Introduction to the Constitution of India, D. D. Basu (26th ed.). > Chapter 14: The State Legislature > New States added since 1950 > p. 293