Expert Answer 100% (1 rating) cyclohepta-1,3,5-triyne. The vertices will give you the qualitative energy of the MOs. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A)It is aromatic. The cycloheptatrienyl (tropylium) cation is aromatic because it also has 6 electronics in its pi system. By making it a cation, it loses 2 of them, meeting the qualification for aromatic compounds.¹. This answer is not useful. The smallest aromatic ion is the cyclopropenyl cation. a.) Could anyone help? Ions may also be aromatic: The tropylium ion (cycloheptatrienyl cation), for example, possesses six π electrons, which occupy all three bonding π MO, such as is the case with benzene. 1,3,5,7-Cyclooctatetraene is an example of a non-aromatic compound, as two of its eight π electrons are located in non-bonding π MO. (A) Cyclopentadienyl anion (B) Cycloheptatrienyl cation (C) Cyclooctatetraene (D) Thiophene. If we consider seven sp2 carbons aligned in a planar ring, this gives us 8 pi electrons. The cycloheptatrienyl (tropylium) cation is aromatic because it … e) … Why? 1.CYCLOPENTADIENYL ANION(C 5 H 5 _). Cycloheptatriene (CHT) is an organic compound with the formula C 7 H 8.It is a closed ring of seven carbon atoms joined by three double bonds (as the name implies) and four single bonds. This would make it non-planar and non-aromatic. 1. Therefore is has 4(2) = 8 conjugated pi electrons. cycloheptatrienyl anion is (a) aromatic, (b) anti-aromatic, or (c) non-aromatic, you would be justified in giving any of the following answers: It is (b) anti-aromatic because it has eight B-electrons (a 4n number) in a cyclic coplanar system of sp2 hybridized atoms. Is it normal to feel like I can't breathe while trying to ride at a challenging pace? Oct 17 2014 06:19 PM 1 Approved Answer The cycloheptatrienyl anion is antiaromatic, whereas the cyclononatetraenyl anion is planar (in spite of the angle stain involved) and appears to be aromatic. Applications of Hamiltonian formalism to classical mechanics. The cyclopentadienyl anion Not aromatic (not cyclic conjugated because one carbon is sp 3 hybridized) Not aromatic (has only 4 π electrons, two from each double bond) Aromatic! Why would someone get a credit card with an annual fee? check_circle Expert Answer . Explain the stability of the protonated product. The chemical formula for the cycloheptatrienyl cation is C₇H₇⁺. It is benzene (C₆H₆). Cycloheptatrienyl anion is anti-aromatic in nature). Is it possible that for an ion to be aromatic? The conjugation does not extend all the way around the ring, so the molecule is not aromatic. A) It Is Aromatic. In this case, it is nonaromatic since the CH 2 carbon is sp 3-hybridized which makes the molecule non-planar and not fully conjugated. (a) (b) | SolutionInn The short lines beneath the central horizontal dashed line represent bonding π MO, while the short lines above the central dashed line represent antibonding π MO. This makes it antiaromatic and highly unstable. check_circle Expert Answer. This colourless liquid has been of recurring theoretical interest in organic chemistry.It is a ligand in organometallic chemistry and a building block in organic synthesis. That should mean that antiaromatic systems are unstable. Aromaticity exists when there are $4n+2$ (i.e. This structure has one carbon too many for all of them to be conjugated. 2 Answers. D) It Undergoes Reactions Characteristic Of Radicals. (Photo Included), Realistic task for teaching bit operations. As a result, neither the cycloheptatrienyl anion nor 1,3,5,7-cyclooctatetraene are aromatic compounds. 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