All of these appeared to be correct. I’ve already counted their hydrogen and carbon number. Please help!
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1(D) is n-heptane only. So, it should be the answer. – Arishta Jan 07 '18 at 06:44
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If you were ever asked to count the total number of structural isomers of heptane, you will definitely count n-heptane as one of them. However, this question has explicitly drawn what "heptane" looks like (actually it's n-heptane), and then asks you to identify which of the following is NOT an isomer of "heptane". Clearly, option D is not an isomer of "heptane", rather "heptane" itself. Hence, D. – Gaurang Tandon Jan 07 '18 at 07:58
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@GaurangTandon Is it because D’s vertical chain isn’t less than D’s horizontal chain. – user28603 Jan 08 '18 at 03:45
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@user28603 It is a single unbroken carbon chain of seven atoms... – Gaurang Tandon Jan 08 '18 at 10:05
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@GaurangTandon So you're saying that the structure drawn in D is the principle chain of Heptane. The structure that is above the question isn't the principle chain of Heptane. Am I right? – user28603 Jan 11 '18 at 05:22
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@user28603 Both the structures (one drawn above the question and the option D) are same (and yes, both are unbranched, n-heptane). But, option D is drawn in a way to make it look different from the other one. See carefully. – Gaurang Tandon Jan 11 '18 at 09:19
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@user28603 You should try to use ball and stick models to visualize better... https://www.amazon.com/Molecular-Model-Organic-Inorganic-Chemistry/dp/B016XJN2G0 – Soham Jan 13 '18 at 17:07
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The structure in the question and option (D) are the same thing. Note that a branching as apparently seems is not a real branch on the principle chain that would give an isomer. Basically (D) is same as that given in the question.
Soham
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The option d should be correct since the name of the compound is the same as the given in the question... They are homomers
Devesh
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