Select the correct pair.

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(B) Let us analyze each option:$A$. The given compounds are $N$-methylbutan$-1-$amine and $N$-methylpropan$-2-$amine. These are position isomers,not c

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$CH_3-CO-CH_2-CH_2-COCl$ and $CH_3-CO-CH(CH_3)-COCl$ are chain isomers.

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(B) Let us analyze each option:$A$. The given compounds are $N$-methylbutan$-1-$amine and $N$-methylpropan$-2-$amine. These are position isomers,not chain isomers.$B$. The first compound is $5$-oxohexanoyl chloride and the second is $4$-methyl-$5$-oxopentanoyl chloride. These are chain isomers because the carbon skeleton of the main chain is different.$C$. Metamers require the same functional group attached to different alkyl groups. Here,the groups attached to the carbonyl group are identical in both structures,just flipped,so they are the same compound,not metamers.$D$. In ethane$-1,2-$diol,the gauche form is more stable than the anti form due to intramolecular hydrogen bonding.Therefore,option $B$ is the correct pair.

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