In the following reaction sequence, $$\mathbf{Q}$$, $$\mathbf{R}$$, $$\mathbf{S}$$ and $$\mathbf{T}$$ are the major products.

The correct statement(s) about $$\mathbf{Q}$$, $$\mathbf{R}$$, $$\mathbf{S}$$ and $$\mathbf{T}$$ is(are)

A

$$\mathbf{S}$$ on warming with ammoniacal $$AgNO_3$$ results in the formation of silver mirror.

B

$$\mathbf{Q}$$ on treatment with $$Cl_2$$ (excess)/UV gives gammaxane.

C

$$\mathbf{T}$$ is a heterocyclic compound.

D

$$\mathbf{R}$$ on acid catalyzed intramolecular cyclization followed by treatment with $$Zn\text{-}Hg/HCl$$ gives $$9,10$$-dihydroxyanthracene.