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In 1931, German chemist and physicist Erich Hückel proposed a theory to help determine if a planar ring molecule would have aromatic properties. His rule states that if a cyclic, planar molecule has 4n+2 π electrons, it is considered aromatic.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agothe rule is that if the number pi electrons is equal to 4n plus 2,where n equals 0,1,2,3,..............,the system will be aromatic,otherwise not.
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What is the value of 'n' for furan while applying Huckel's rule?
A cyclic ring molecule follows Hückel's rule when the number of its π(pi)-electrons equals 4n+2 where n is zero or any positive integer, although clearcut examples are really only established for values of n = 0 up to about n = 6A furan structure is a planar 5 membered ring with one O atom in its ring on which one pi-pair is situated. This leaves another 2 pi-pair's for two double bonds, a total of 6 (3 pi-pairs) obeys Hückel's rule for the n=1 value.Thus furan is aromatic as benzene (also n=1, 6 pi-electrons in 3 pi-pairs).[See 'Related links' just below this answer page]
Is Angola a direct rule or indirect rule?
indirect
What rule by a powerful individual called?
Authoritarian Rule
What rule do the nonmetal atoms follow?
octet rule
What is a metal rule used for?
A rule is used to measure a distance.
What is huckel structure of benzene?
Huckel's rule does not explain the structure of a molecules it simply describes that a molecule is aromatic or not, the kekule's structure for benzene agrees with Huckel's rule.
How is huckel rule applied in determining aromaticity?
Huckel's rule is used in aromaticity by stating that monocyclic systems are aromatic. This will happen if there are delocalized electrons.
How to calculate UV spectroscopy for beta-carotene?
By the Huckel determinant
What has the author Linda Huckel Morley written?
Linda Huckel Morley has written: 'Contributions toward a special library glossary' -- subject(s): Administration, Dictionaries, Library science, Special libraries
What has the author Roland Huckel written?
Roland Huckel has written: 'Un billet entre les orteils' -- subject(s): Art and the war, Biography, French Personal narratives, Russian Prisoners and prisons, Soldiers, World War, 1939-1945
Is benzoquinone aromatic?
No - although it has sufficient electrons to obey the Huckel rule (4n+2) pi electrons. The two olefins in the ring are cross-conjugated through the carbonyl groups. The lack of proper conjugation precludes aromaticity. The non aromaticity is evidenced by different bond-lengths around the ring
Why tropylium ion is more stable than triphenyl carbocation?
as because in case of tropylium cation extra stability arises from the attainment of aromaticity as well as extensive conjugation.It contains 6π electrons which is according to Huckel's rule indicate towards the aromatic compound as well as the system is also a resonance stabilized because of delocalisation
What has the author Merwyn R Buchanan written?
Merwyn R. Buchanan has written: 'Descendants of William & Maria Susannah (Uhle) Huckel' -- subject(s): Family
Give three reasons that the King and Duke were able to take advantage of people in Huckel Berry Finn?
flamboyant, actors, people want to be fooled during hard times
Why is the cyclopentadienyl anion aromatic?
No it does not obey the 4N+2 electrons... it has 4 pi electrons... it is anti aromatic however the ion is aromatic which explains its relatively low pka value of 15-16 which is on par with alcohols which are generally 16-18pka
What is an explanation of huckels rule of Aromaticity?
A cyclic molecule or ion having different resonating structure follows Hückel's rule when the number of its π-electrons equals 4n+2 where n is zero or any positive integer. Example (4 x (0)) + 2 = 2 π electrons (4 x (1)) + 2 = 6 π electrons (4 x (2)) + 2 = 10 π electrons etc Taking benzene as an example, it has 3 double bonds so 6 π electrons (2 electrons for each double bond) thus it fits Huckels rule and therefore is aromatic. If the molecule is an ion and has a negative charge, the negative charge is also counted as 2 π electrons. Positive charges on a cyclic molecule are ignored.
What is the value of 'n' for furan while applying Huckel's rule?
A cyclic ring molecule follows Hückel's rule when the number of its π(pi)-electrons equals 4n+2 where n is zero or any positive integer, although clearcut examples are really only established for values of n = 0 up to about n = 6A furan structure is a planar 5 membered ring with one O atom in its ring on which one pi-pair is situated. This leaves another 2 pi-pair's for two double bonds, a total of 6 (3 pi-pairs) obeys Hückel's rule for the n=1 value.Thus furan is aromatic as benzene (also n=1, 6 pi-electrons in 3 pi-pairs).[See 'Related links' just below this answer page]
