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(C) The given compound is $3-$ethyl$-2-$methylhexane. First,determine the molecular formula by counting the total number of carbon atoms. The parent c

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$n-$nonane

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(C) The given compound is $3-$ethyl$-2-$methylhexane. First,determine the molecular formula by counting the total number of carbon atoms. The parent chain is hexane ($6$ carbons),plus an ethyl group ($2$ carbons) and a methyl group ($1$ carbon). Total carbons = $6 + 2 + 1 = 9$. The general formula for an alkane is $C_nH_{2n+2}$. For $n=9$,the formula is $C_9H_{20}$. An isomer must have the same molecular formula. Among the options,$n-$nonane $(C_9H_{20})$ is the straight-chain isomer of $3-$ethyl$-2-$methylhexane.

Identify the straight-chain hydrocarbon that is an isomer of $3-$ethyl$-2-$methylhexane.

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