Correct Answer: Option A

Explanation

Chemical compounds that have identical chemical formulae but differ in properties and the arrangement of atoms in the molecule are called isomers. Isomers have the same molecular formulas but different structural formulas. 

The diagram in the given question is 3-methylpentane (C\(_6\)H\(_{14}\)). As we consider the given options,

Option A is 3-ethylpentane (C\(_7\)H\(_{16}\))

Option B is 3-methylpentane (C\(_6\)H\(_{14}\))

Option C is 2-methylpentane (C\(_6\)H\(_{14}\))

Option D is 2-methylpentane (C\(_6\)H\(_{14}\))

From our analysis, all the options except option A has C\(_7\)H\(_{16}\) which doesn't match with the compound given in the question. Hence, it is not an isomer of the compound with the formula C\(_6\)H\(_{14}\).

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