Which of the following is antiaromatic

In contrast to the diamagnetic ring current present in aromatic compoundsantiaromatic compounds have a paramagnetic ring current, which can be observed by NMR spectroscopy, which of the following is antiaromatic. Examples of antiaromatic compounds are pentalene Abiphenylene Bcyclopentadienyl cation C. The prototypical example of antiaromaticity, cyclobutadieneis the subject of debate, with some scientists arguing that antiaromaticity is not a major factor contributing to its destabilization. Cyclooctatetraene is an example nyyxxii a molecule adopting a non-planar geometry to avoid the destabilization that results from antiaromaticity.

Hence, is anti-aromatic. Get Started. SSC Exams. Banking Exams. Teaching Exams.

Which of the following is antiaromatic

Which of the following is an antiaromatic compound? Which of the following species are antiaromatic? Which of the following are pairs of antiaromatic species? Which of the following species is antiaromatic? Consider the following reactions : Which of the following are stereospecific reactions? Antidepressant drugs follow which of the following mechanism? Sulphur, on heating follows Which of the following sequence? Match the following: Which of the following is the best matched options? Which of the followig is aromatic? Which of the following is not aromatic? Which of the followng is the least reactive towards addition reactions The order of stability of the species i , ii and iii is. In which of the following compounds are the hydrogen atoms atoms of th Which of the following is expected to be the least stable? Which of the followig is not aromatic?

WB Gram Panchayat. At this point of time, it is presumed that cyclobutadiene will continue to be used to introduce the concept of antiaromaticity in textbooks as a matter of convenience, even though classifying it as antiaromatic technically may not be accurate.

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If a compound does not have a continuous ring of conjugated p orbitals in a planar conformation, then it is nonaromatic. Huckel's Rule is a useful first step in evaluating the potential for a ringed molecule to be aromatic. The planar requirement of the ring may require further investigation. When deciding if a compound is aromatic, go through the following checklist. If the compound does not meet all the following criteria, it is likely not aromatic. This is true of aromatic compounds, meaning they are quite stable.

Which of the following is antiaromatic

In short, the only way aromatic and antiaromatic compounds differ is the number of electrons they have in the conjugated system. All the other criteria — being cyclic, planar, and fully conjugated are a must for both categories:. There is also the third class of compounds we need to discuss: These are the nonaromatic or not aromatic compounds. As the name suggests, nonaromatic compounds have really nothing to do with the aromaticity well, almost. And that is the idea, nonaromatic compounds are the ones not related to the aromatic and antiaromatic compounds:. In fact, if any of these factors; cyclic, planar, fully conjugated does not match — the compound is said to be nonaromatic.

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Bibcode : JChPh. If an experimentally determined structure of the molecule in question does not exist, a computational analysis must be performed. Bihar Elementary Teacher. Which of the following is expected to be the least stable? BSF Constable. Odisha Police Constable. OFDC Assistant. CWC Junior Superintendent. Maharashtra Prison Department. BSF Water Wing. KVS Stenographer. UP Police Assistant Operator. FCI Watchman. Antiaromaticity can also have a significant effect on p K a.

Aromatic, Non-Aromatic, or Antiaromatic? Some Practice Problems.

The negative charge is also delocalized in the system. Its structure has been studied computationally via ab initio and density functional theory calculations and is confirmed to be antiaromatic. OSSC Accountant. Rajasthan High Court Clerk. ISBN Toggle limited content width. Bihar Police Prohibition Constable. Maharashtra Agricultural Officer. Rajasthan Pre D. Gujarat Metro Maintainer. Maharashtra Zilla Parishad Gram Sewak. Answer Detailed Solution Below Option 2 :. Maharashtra Zilla Parishad Health Worker. India Post Mail Guard. However, in reality, it is difficult to determine whether or not a molecule is completely conjugated simply by looking at its structure: sometimes molecules can distort in order to relieve strain and this distortion has the potential to disrupt the conjugation.