Which of the following is correctly matched?

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(D) Let us analyze each option:$A$: Pentanal $(CH_3CH_2CH_2CH_2CHO)$ and $2$-methylbutanal $(CH_3CH_2CH(CH_3)CHO)$ are chain isomers,not positional is

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Ethylcyclobutane and $1,2-$dimethylcyclobutane are positional isomers.

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(D) Let us analyze each option:$A$: Pentanal $(CH_3CH_2CH_2CH_2CHO)$ and $2$-methylbutanal $(CH_3CH_2CH(CH_3)CHO)$ are chain isomers,not positional isomers.$B$: The structures shown are the same molecule ($2$-bromobutane) represented in the same configuration. They are identical,not enantiomers.$C$: The structures are $trans$-$1$-bromo-$2$-chlorocyclobutane and $cis$-$1$-bromo-$2$-chlorocyclobutane. These are diastereomers,not enantiomers.$D$: Ethylcyclobutane and $1,2$-dimethylcyclobutane are isomers with the same molecular formula $(C_6H_{12})$ but different arrangements of substituents on the ring,which classifies them as positional isomers.

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