Question

show that tropylium ion is aromatic in nature.​

Answer 1

Tropyllium cations are aromatic in nature. This is because it has six π electrons (4n + 2, n = 1) that satisfy Huckel's law of aromaticity as well as its planar nature.

Explanation:

• In organic chemistry, the tropylium ion or cyclo hepta triphenyll cation is an aromatic species of formula [C7H7] +.
• The 6pi electrons of the tropylium cation completely fill the bound molecular orbital.
• This is consistent with the fact that the tropyrium cation is aromatic and therefore unusually stable. As predicted by aromaticity, the positive charge is fully conjugated around the entire ring, giving each carbon a +1/7 charge.
• Tropyllium cations are the most stable of the listed cations due to their extended conjugation and resonance.
• Tropyllium cations are more stable than benzyl cations, just because they have seven resonant structures, whereas there are five benzyl cations.
• More resonating structures, more stability.

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Answer 2

Answer:

Tropyllium ions are aromatic in nature. This can be confirmed by the fact that it has 6 π-electrons that satisfy Huckel's law of aromaticity as well as its planar nature.

Explanation:

• In organic chemistry, the tropylium ion is cycloheptatriphenyl according to IUPAC nomenclature.

• It is an aromatic species with the formula $[C_7H_7]^+$

• The 6 π-electrons of the ion completely fill the bonding molecular orbitals.

• This is consistent with the fact that the ion is aromatic and therefore, highly stable.

• The positive charge is fully conjugated around the entire ring, giving each carbon a +1/7 charge, confirming its aromaticity.

• These ions are the most stable of the aromatic cations because of their extended conjugation and resonance.

• In the case of comparison with benzyl cations, tropyllium is much more stable, owing to the higher number of resonance structures.

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