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NEET levelSingle correct optionDifficulty 1 of 3nm120

Which of the following pairs does NOT consist of isomers?

A $CH X_{3} CH X_{2} CHO$ and $CH X_{3} COCH X_{3}$
B $CH X_{3} COOH$ and $HCOOCH X_{3}$
C $CH X_{3} CH X_{2} OH$ and $CH X_{3} CHO$
D $CH X_{3} CH X_{2} CH X_{2} OH$ and $CH X_{3} OCH X_{2} CH X_{3}$

Answer: C

Isomers must have the same molecular formula. Ethanol is

C X_{2} H X_{6} O

but ethanal is

C X_{2} H X_{4} O

, so they are not isomers. The other pairs are

C X_{3} H X_{6} O

,

C X_{2} H X_{4} O X_{2}

and

C X_{3} H X_{8} O

respectively, each with identical formulas.

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