Which one of the following is NOT a Union Territory of India ?

The correct option is Manipur.

Step-by-Step Explanation:

1. Understanding Union Territories vs. States:
In India, a State is an independent administrative unit with its own elected state government, whereas a Union Territory (UT) is a federal territory governed directly by the Central Government of India.

2. Analyzing the Options:
- Ladakh: Formed as a Union Territory of India on October 31, 2019.
- Jammu & Kashmir: Reorganized into a Union Territory of India on October 31, 2019.
- Chandigarh: Serves as a Union Territory and the joint capital of Punjab and Haryana.
- Manipur: Manipur is a full-fledged State in northeastern India (it attained statehood in 1972) and is not a Union Territory.

3. Conclusion:
Therefore, Manipur is NOT a Union Territory of India.