Which of the following compounds is a constitutional isomer of 2-pentanone?

Question

Quizplus · Accepted Answer

Constitutional isomers have the same molecular formula but different connectivity of atoms. Both 3-methyl-2-pentanone and isopropyl methyl ketone have the same molecular formula as 2-pentanone (C5H10O), but with a different arrangement of atoms, making them constitutional isomers. Therefore, both choices A and C are correct. Choice B, 3-methyl-2-butanone, has a different molecular formula than 2-pentanone (C5H10O vs C5H10O2), so it is not a constitutional isomer.

Which of the Following Compounds Is a Constitutional Isomer of 2-Pentanone