Can you glue a PVC pipe to a cpvc fitting if so which glue do you use?

Not unless you have a transitional fitting. The diameters of the two are not the same. I know sometimes it can feel like they fit together snugly but they will not hold the pressure.

ANS 2 - AS he says above, you can glue it but it's only usable for drainage, not regular water pressure. Use Weld-On 794 to glue it