Which of the following substances is not an i | vedclass

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(D) $3$-ethyl-$2$-methylpentane has the molecular formula $C_8H_{18}$ (it contains $8$ carbon atoms).$n$-Heptane $(C_7H_{16})$,$2,3$-dimethylpentane $

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All are isomers

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(D) $3$-ethyl-$2$-methylpentane has the molecular formula $C_8H_{18}$ (it contains $8$ carbon atoms).$n$-Heptane $(C_7H_{16})$,$2,3$-dimethylpentane $(C_7H_{16})$,and $3$-methylhexane $(C_7H_{16})$ all contain only $7$ carbon atoms.Since isomers must have the same molecular formula,none of the given options are isomers of $3$-ethyl-$2$-methylpentane. However,if the question implies identifying which one is $NOT$ an isomer,and all options have $7$ carbons while the parent has $8$,then all are technically not isomers. Given the structure of such questions,if one must be chosen,all are incorrect. Assuming the question asks for the one that is not an isomer,and all options provided are $C_7$ compounds,they are all not isomers of the $C_8$ compound.

Which of the following substances is not an isomer of $3$-ethyl-$2$-methylpentane?

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