You are welcome. Please read the blog shared too.
Ductile detailing is optional in Seismic Zone 2 as per IS 13920
Ductile detailing is mandatory only in seismic zone 3 and above.
You can read clause 1.1.1 of IS 13920 2016 which clearly says that the code provision is applicable to Seismic zone III and above.
For better performance, if you really want you can adpot it in zone 2 also. That is your choice.
I have explained 4 virtues of seismic resistance and importance of ductility in this blog here