Question

Ph

COOH

$H_2SO_4$ $\Delta$

Answer 1

The product of the reaction is 1-tetralone.

Answer 2

5-phenylpentanoic acid undergoes intramolecular Friedel-Crafts acylation when treated with $H_2SO_4$ and heat. The carboxylic acid forms an acylium ion, which then attacks the ortho position of the phenyl ring, leading to the formation of a stable six-membered cyclic ketone, 1-tetralone, with the elimination of water.