What is the value of n in CH3(CH2)nCH3 if the name of the hydrocarbon is heptane?

Heptane has 7 carbon atoms. In CH3(CH2)nCH3, the two CH3 groups contribute 2 carbons, and the (CH2)n group contributes n more, so 2 + n = 7. Therefore n = 5, which is choice B.

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