Final answer:
The isomer of C6H6OH (phenol) is D. C2H5OH, which is ethanol. Isomers share the same molecular formula but differ in structure, and ethanol has the same molecular formula as a hydroxylated benzene compound. The correct option is D.
Step-by-step explanation:
The compound that is an isomer of C6H6OH is D. C2H5OH (ethanol). An isomer refers to a compound with the same molecular formula but a different structure. Therefore, the correct answer has to have the same number of carbons, hydrogens, and oxygens as C6H6OH.
- Option A: C₃H₂CH₃ is not an isomer because it has a different molecular formula.
- Option B: C₂H₅OC₂H₅ is commonly known as diethyl ether, and it has the molecular formula C4H10O, which is again different from C6H6OH.
- Option C: CH₃COOH is acetic acid and has a molecular formula of C2H4O2, which is not the same as C6H6OH.
- Option D: C₂H₅OH, which is ethanol, has the same molecular formula of C2H6O when considering benzene (C6H6) has been oxidized to a phenol (C6H5OH). This is the correct answer.