The UV spectrum of 1-phenylprop-2-en-1-ol shows an intense absorption at 220 nm and a weaker absorption at 258 nm. When this compound is treated with dilute sulfuric acid, it rearranges to an isomer with an intense absorption at 250 nm and a weaker absorption at 290 nm. Suggest a structure for the isomeric product and propose a mechanism for its formation.

UV-Vis spectroscopy is a technique used to measure the absorption of ultraviolet or visible light by a compound. The wavelengths at which a compound absorbs light can provide insights into its electronic structure, particularly the presence of conjugated systems or functional groups. In this case, the absorption peaks at 220 nm and 258 nm indicate the presence of π-π* transitions, which are characteristic of alkenes and aromatic compounds.

Rearrangement mechanisms involve the reorganization of atoms within a molecule to form a new isomer. In organic chemistry, this often occurs through the migration of groups or atoms, typically facilitated by acidic conditions. The treatment of 1-phenylprop-2-en-1-ol with dilute sulfuric acid likely leads to a protonation step followed by a shift of the double bond, resulting in a new isomer with different UV absorption characteristics.

Isomerism refers to the phenomenon where compounds have the same molecular formula but different structural arrangements or spatial orientations. In this scenario, the isomeric product formed from 1-phenylprop-2-en-1-ol exhibits different UV absorption peaks, suggesting a change in its electronic structure. Understanding the types of isomerism, such as structural and geometric isomerism, is crucial for predicting the properties and reactivity of the resulting compounds.