According to Huckel s Rule hic of the following compounds are aromatic? Do not e

Question

According to Huckel s Rule hic of the following compounds are aromatic? Do not explain. The triene A can be readily deprotonated twice to give the stable dianion B. However the neutral analog of B, the tetraene C (pentalene), is extremely unstable. Briefly explain. Place the following molecules in order of decreasing acidity. (Most acidic to least acidic) Do not explain. Place the following molecules in order of decreasing basicity. (Strongest to weakest) Do not explain. Which nitrogen atom is the least basic in purine?

Explanation / Answer

1. A, D, H, J, K, L, M

2. Compound B is aromatic and has (4n + 2)pi electrons according to Huckel rule and is stable

but compound C has 4n pi electrons and is anti-aromatic and therefore extremely unstable

3. B>E>D>A>C

4. D>B>A>C

5. D

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