One among the following pairs of compounds are not isomers?

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${({CH}_{3})}_{2} CH - O - C_{2} H_{5}$ and ${CH}_{3} {({CH}_{2})}_{2} - O - C_{2} H_{5}$

${CH}_{3} {CH}_{2} {CO}_{2} H$ and ${CH}_{3} {CO}_{2} {CH}_{3}$

${CH}_{3} {COCH}_{3}$ and ${CH}_{3} {CH}_{2} {CH}_{2} OH$

${CH}_{3} {CO}_{2} {CH}_{3}$ and ${CH}_{3} {CH}_{2} COOH$

answer is C.

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Detailed Solution

Isomers are organic molecules that have the same molecular formula (i.e., the same number of atoms of each element) but different arrangements of atoms within the molecule.
In other words, isomers are compounds that have identical molecular formulas but different structural formulas, leading to different physical and chemical properties.
The given compounds are: CH₃COCH₃ (acetone) and CH₃CH₂CH₂OH (1-propanol).
These two compounds are not isomers because they have different molecular formula.
Acetone has the molecular formula of $C_{3} H_{6} O$ and 1-propanol has the molecular formula of $C_{3} H_{8} O$ .