LR 6.x doesn’t have Dehaze as it is would be an enhancement after the initial .0 release. LR CC 2015 does get Dehaze and Boundary Warp for Panoramas among other things. LR 7 is when the serial-number-licensed LR would get new features, assuming there is going to be a LR 7.
Dehaze silder is only available in Lightroom CC 2015 not in the standalone version Lightroom 6
The Dehaze effect is only available in the CC version of Lightroom and not in the box versions.
But there are several workarounds in the Web.
For example take a look here: https://forums.adobe.com/thread/1872965?start=0
Thank you all for the answer. This is the first time I've asked for assistance and I am totally pleased that people read and answer questions. You are all awesome.