No, unfortunately not, I have just tried it out. I don't know of a single lens hood that would fit the RF 35 1.8 ...

I cannot answer this question with certainty, as I only have the old EF 70-300mm f4 - 5.6 IS USM. In any case, the Soble ES-68 officially belongs to the EF 50mm f/1.8 STM lens.

No. The following product fits the Canon EF-S 18-135mm f/3.5-5.6 IS USM : Canon EW-73D Lens Hood