Chapter 19, Problem 19.8P

Interpretation Introduction

Interpretation:

The explanation for the observation that addition of $\text{NaOH}$ in the solution increases the ${\lambda }_{\max }$ of $p\text{-hydroxyacetophenone}$ by about $50\text{ nm}$, but do not affect ${\lambda }_{\max }$ of $p\text{-methoxyacetophenone}$ is to be stated.

Concept introduction:

Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Molecules have bonding or non-bonding electrons that can absorb light while promoting electrons from the ground state (HOMO) to an excited state (LUMO). The light absorbed is usually in the UV or visible region. Conjugation in the molecule also affects the wavelength of light absorbed.