How many chain isomers can an aliphatic saturated hydrocarbon with 7 carbons make?
Correct answer: D. 9
- A. 7
- B. 5
- C. 12
- D. 9
Explanation
An aliphatic saturated hydrocarbon with 7 carbons is an alkane, represented by the formula C₇H₁₆. Chain isomerism occurs when the carbon skeleton of the molecule can be rearranged in different ways, resulting in different compounds with the same molecular formula. For C₇H₁₆, there are exactly 9 distinct arrangements or chain isomers possible. Hence, the correct answer is 9.Option A (7) is incorrect because it underestimates the number of possible isomers. Option B (5) is also incorrect as it is an underestimation. Option C (12) overestimates the number of isomers. Therefore, Option D (9) is the only correct choice.
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