which of the following is an isomer of ch3-ch2-cooh?

Question

CH3 - C - OH - CH3

CH3 - CO - O - CH3

CH3 - CO - CO - CH3

CH3 - CH2 - CO2 - CH3

Answer 1

An isomer is a structure with a different arrangement of the same number of atoms. All of the above answers except for the second option have a different number of atoms.