In Chapter 11 cases yes it is however in a Chapter 7 case administrative claims become #1.
Tax claims are not on your list but fall between #3 secured ..and #4 unsecured claims.
Note: there are times absolute priority is not followed verbatim. For example there may be an unsecured creditor in a ch 11 reorg who is deemed critical to the operation and may get paid ahead of a more senior class of creditor.