Phenolic esters heating with `AlCl_(3)` (Lewis acid ) gives ortho and para acyl phenol . This is known as Fries rearrangement .
In general, low temperature favours the para product and high tempearture favaous orhto product .
Mechanism :
If one of the ortho position is subtituted by any group then para is the major product
`overset(AlCl_(3))to ` Major product :
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B.
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