Huckel’s Rule for Aromaticity is defined as,
Any Cyclic, highly conjugated, planar structure containing [4n+2] pi electrons (n = whole number 0,1,2………. And not the ring number) is Aromatic in nature and has extraordinary stability.
In (A) 1 C is sp3 hybridized and hence planarity of ring destroyed and cyclic conjugation also not possible hence (A) is Non-aromatic in nature.
In (B) –It’s a cyclic 5 C system 4 C which are doubly bonded are sp2 hybridized (4 pi electrons) and 1 C a carbanion which though sp3 hybridised but as conjugates its lone pair of electron in pi electron system gets planarity. Also 4 pi electrons + 2 electrons in –ve charge on carbanion makes total of 6 electrons i.e [4n+2] electrons (n = 1 makes it =4 x1 + 2 = 6 pi electrons). Hence The cyclopentadinyl anion is a Cyclic, highly conjugated, Planar structure with [4n+2] pi electrons system and thus is Aromatic by Huckel’s rule.
Indicate whether or not each of the following structures is considered to be aromatic. A is...
Indicate whether or not each of the following structures is considered to be aromatic. Indicate whether or not each of the following structures is considered to be aromatic. A is aromatic, B is not. B is aromatic, A is not. Both A and B are aromatic. A and B are not aromatic.
Indicate whether or not each of the following structures is considered to be aromatic. Indicate whether or not each of the following structures is considered to be aromatic. A is aromatic, B is not. B is aromatic, A is not Both A and B are aromatic. A and B are not aromatic.
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Indicate whether or not each of the following structures is considered to be aromatic. Indicate whether or not each of the following structures is considered to be aromatic.
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indicate whether or not each of the following structures is considered to be aromatic. NH O A is aromatic, B is not O B is aromatic A is not O Both A and B are aromatic O A and Bare not aromatic. NH
Indicate whether or not each of the following structures is considered to be aromatic.