Yes, we expect the BME680 to be sensitive to Benzene. Of course in your application, it will depend on the concentration you are trying to detect and on the other gases present in the mixture at the same time.
What also is very interesting:
The BME680 "detect" the smell of flowers (flowering plants) ... 😉 (I think some of them)
If you open the window in such a case that the smell of flowering plants is noticeable outside - the IAQ inside will be bad (>150...200) instead of lower value.
So not in any case it can be perfect 😉