What is the IUPAC name of Ph−CH\=CH−CHO?
The compound has a 3-carbon chain with an aldehyde group (prop-2-enal) and a phenyl group on C-3: 3-phenylprop-2-enal.
Ref: NCERT Class 12 Chemistry > Chapter 12: Aldehydes, Ketones and Carboxylic Acids > Topic: Chemical Reactions - Reduction, Oxidation and Tests - Tollens, Fehling, Iodoform