Which of the following ethers ethers is ...

Which of the following ethers ethers is the most unreactive to cleavage with conc. HBr?

`Ph-CH_(2)-O-CH_(3)`

`Ph-O-Ph`

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Which of the following ethers is the most unreactive to cleavage with concentrated HBr ?

`C_(6)H_(5)OC_(6)H_(5)`

`C_(6)H_(5)CH_(2)OC_(6)H_(5)`

`CH_(3)CH_(2)O Na` and `C_(2)H_(5)I`

`CH_(3)-CH_(2)-OHunderset(140^(@)C)overset(H^(o+))(to)`

`CH_(3)-CH_(2)-Ioverset("dry"Ag_(2)O)(to)`

All of the above

`CH_(3) -O-CH_(3)`

`CH_(3) -CH_(2) -OH `

`CH_(3) -CH_(2) -CH_(2) -OH `

`CH_(3)-O-H`