The IUPAC name of the given compound is .

2 - m e t h y l - 5 - e t h y l h e p t a n e

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5 - e t h y l - 2 - m e t h y l h e p t a n e

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3 - m e t h y l - 6 - e t h y l h e p t a n e

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Solution

The correct option is B $5 - e t h y l - 2 - m e t h y l h e p t a n e$
The word root here is hept as there are 7 carbons in the parent chain of the compound. The numbering here starts from right to left, according to lowest sum rule. There are two substituent groups, ethyl group and methyl group at the fifth and second carbons of the compound respectively. Hence, the IUPAC name of the compound is 5-ethyl-2-methylheptane.

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