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I was solving problems in Organic Chemistry related to Substitution and Elimination. This was a question asked in JEE 2019

The question

This was the solution for above.

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At last of solution, It has been mentioned that after rearrangement it undergoes"ArSE2 Pathway".

What is meant by ArSE2 pathway/mechanism?

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This looks like a standard Friedel-Crafts reaction, although it is intramolecular rather than intermolecular. The cation undergoes electrophilic substitution to give the product.

The choice of terminology used by the authors is strange: a search for "ArSE2" returns very few links, such as this one. There seems to be no commonly known reaction mechanism with this name, and the author was most likely referring to standard electrophilic substitution.

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    $\begingroup$ Electrophilic aromatic substitution is denoted as $\ce{S_{E}Ar}$. $\endgroup$ – Nilay Ghosh Aug 31 '20 at 5:03

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