can i upgrade directly to the latest IS from Yosemite
Can I upgrade directly to the latest OS from Yosemite?
iMac 27″, OS X 10.10
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No. Yosemite uses 32 bit apps ... Catalina and later use 64 bit apps.
Also, the various iMac models have limits in how far they can update.
How to: Identify your iMac model – Apple Support
NB: says: Models introduced in 2017 or later can run the latest version of macOS.
For older models, the latest compatible operating system is noted.
All the best :-)