Question
Oxidising action increases in halogen in the following order
Among halogens $F$ is the directly most powerful oxidising agent.
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phenol $\xrightarrow[{reaction}]{{\operatorname{Re} imer - Tiemann}}X\xrightarrow[{(ii)\,{H^ \oplus }}]{{(i)\,NaOH\,conc}}Z$
Product $Z$ is