So sorry if there're mistranslation or error or something...
*edit: forgot to put question translation:
When using an aqueous solution □ in an ether solution in which phenol and benzoic acid are dissolved, only the benzoic acid will be transferred to the aqueous layer. Which one of the following names (1-4) is in □?
Chapter can't be read, it says "Google Drive - You need access"
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