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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm161

Which of the following pairs consists of compounds that are NOT isomers of each other?

A2-methylpropene and cyclobutane
Bbutan-2-one and butanal
Cbuta-1,3-diene and but-1-yne
Dcyclohexane and hex-1-yne

Answer: D

Compare formulas: cyclohexane is

C X_{6} H X_{12}

and hex-1-yne is

C X_{6} H X_{10}

(not isomers). 2-Methylpropene and cyclobutane are both

C X_{4} H X_{8}

, buta-1,3-diene and but-1-yne are both

C X_{4} H X_{6}

, and butan-2-one and butanal are both

C X_{4} H X_{8} O

.

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