${\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{O}-\mathrm{R}$ when treated with hydrogen halide gives

${\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{O}-\mathrm{R}$ when treated with hydrogen halide gives

Alkyl aryl ethers always produce phenol and an alkyl halide as their byproducts. $\mathrm{O}-{\mathrm{CH}}_2{\mathrm{CH}}_3$ bond is less durable $\mathrm{O}-{\mathrm{C}}_6{\mathrm{H}}_5$ which has a partial double bond personality.