What is the name of this plant which is located in Hyderabad city of Telangana State,India?
From the twisted overlapping appearance of the petals it is a member of the Apocynaceae family.  So I searched for &quot;Apocyanaceae india&quot; and found images consistent with your picture.  Good chance it is Allamanda blanchetii or Purple Allamanda.  Here is a picture comparable to yours (source/CC0).

Here's a bit about the plant and Wikipedia has a short page.