Ethers can only react with HBr and HI.
If they ask for products you have to follow the table, while if they ask for the ingredients to prepare an ether you have to assign the less hindered side to the X. In the second case your alkyl halide can't be vinyl, phenyl, or tertiary.
In Claisen rearrangement you have a phenyl and an allyl on each side of the ether. You have to start numbering form the double bond towards the O, and then shift the double bond to carbons 2-3.
Epoxides:
If a reaction whose product is an epoxide has a reactant with an X you have to use NaOH/H-.
If there is no X, the reaction will happen if there is Ag2O/O3/300C or molecules with CO3.
The base always attacks the less hindered side.
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