This post is to inform you all about the excellent link from VMware which tells about the upgrade path/Solution interoperability of ESX/ESXi and vCenter Server. 
The above Link has three Options
1.Solution Interoperability
2.Solution/Database Interoperability
3.Solution Upgrade Path
Solution Interoperability
This section let you find the information about various VMware Products interoperability. For example, you want to find the compatible vCenter versions to manage ESX/ESXi 3.5 U5 servers. Similar to that you can check compatibility between various VMware products.
Solution/Database Interoperability
This section let you find the information about various VMware Products (VMware vCenter,update manager,site recovery manager ) with the various database products interoperability. For example, you can find the compatible database versions (SQL,oracle) for various vCenter versions. I have checked for vCenter 5 compatibility with different versions of database products.
Solution Upgrade Path
This section let you find the information about various VMware Products upgrade paths (vCenter, ESX/ESXi ,Site recovery manager,vCloud director,vCenter operations). Refer the below snaps for ESX/ESXi and vCenter upgrade patchs.
Thanks for Reading !!!!