Chemistry - STRUCTURAL ISOMERISM Question with Solution | TestHub

Count the molecular formulas : (A) 1-(prop-1-ynyl)cyclopentanol is ${\mathrm{C}}_8{\mathrm{H}}_{12}\mathrm{O}$; (C) 2,5-diethylfuran is ${\mathrm{C}}_8{\mathrm{H}}_{12}\mathrm{O}$; (D) 1-ethynylcyclohexanol is ${\mathrm{C}}_8{\mathrm{H}}_{12}\mathrm{O}$. Compound (B), 3,5-dimethylcyclohexa-2,5-dien-1-one, is ${\mathrm{C}}_8{\mathrm{H}}_{10}\mathrm{O}$ - it has two hydrogens fewer, so it is not an isomer of the others.