Which among the following constitutional amendments of the Indian Constitution deals with the formation of Sikkim as a state?

36^th

The correct answer is Option 1 - 36^th

The constitutional amendment that deals with the formation of Sikkim as a state is the 36th Amendment Act of 1975. This amendment granted Sikkim the status of an Associate State of India, and later in 1975, through the 36th Amendment Act, Sikkim was included as the 22nd state of India.