Tabarruk

Q: Is it permissible to drink from a glass which has been used by ones teacher with the intention of tabarruk? How do we determine which things are permissible to use for tabarruk?

Alcohol being impure

Q: I have been reading online but there are different views. Some scholars say that alcohol is haram to consume but it is not impure in literal sense and not impure to touch. Similarly some scholars say it is haram to consume and also impure to touch. If we go to a place that serves alcohol will the table or other places be regarded as impure. Please shed some light.