can I open 32 bit applications in Catalina

If you need to use 32-bit apps on a Mac running macOS Catalina, you basically have three choices:

1. Check with the app developer to see if they now provide a 64-bit version of the app.
2. Use a VM manger, like Parallels or VMware, to create a VM of an earlier release of an Apple OS that still supports these apps. Then switch to that VM when you need to access them.
3. Create an additional APFS volume on your Mac, and install an earlier Apple OS release. Then boot up with that volume.

No.

No

32-bit app compatibility with macOS ... - Apple Support

https://support.apple.com/en-us/HT208436