GRE Subject Test: Chemistry : Aromatic Chemistry

Study concepts, example questions & explanations for GRE Subject Test: Chemistry

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Example Questions

Example Question #3 : Other Groups

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What is the value of \(\displaystyle n\) from Huckel's rule for the given aromatic compound?

Possible Answers:

\(\displaystyle n=5\)

\(\displaystyle n=4\)

\(\displaystyle n=3\)

\(\displaystyle n=6\)

\(\displaystyle n=2\)

Correct answer:

\(\displaystyle n=4\)

Explanation:

Huckel's rule states that an aromatic compound must have \(\displaystyle 4n+2\) delocalized electrons. The electrons in each double bond are delocalized for this molecule. There are nine double bonds, and thus eighteen delocalized electrons.

If 4n+2=18, then n=4.

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