Compound $\mathrm{I}$ is heated with Conc. $\mathrm{HI}$ to give a hydroxy compound A which is further heated with $\mathrm{Zn}$ dust to give compound $\mathrm{B}$. Identify $\mathrm{A}$ and $\mathrm{B}$.

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Alkyl aryl ethers are cleaved at the alkyl-oxygen bond due to the more stable aryl-oxygen bond. The reaction yields phenol and alkyl halide.

And then Phenol is converted to benzene on heating with zinc dust.