In geography classification questions, carefully examine whether all locations belong to the same administrative category such as state capitals, union territories, districts, or metropolitan cities.
Concept:
Most of the listed places are state capitals of states in India.
Step 1: Identify each city.
• Aizawl --- Capital of Mizoram.
• Bhopal --- Capital of Madhya Pradesh.
• Chennai --- Capital of Tamil Nadu.
• Dispur --- Capital of Assam.
• Hyderabad --- Capital of Telangana.
• Imphal --- Capital of Manipur.
• Chandigarh --- Capital of both Punjab and Haryana (Union Territory).
Step 2: Observe the distinction.
All the others are capitals of individual states.
Chandigarh is a Union Territory and serves as the capital of two states simultaneously.
Hence it is different from the rest.
Step 3: Conclusion.
Therefore the odd one out is
\[
\boxed{\text{Chandigarh}}.
\]