Annelation Effect in Aromatic Systems Explained in 1 Minute ⏱️

For feedback and business queries, please email us at suviganu@gmail.com This video is about annelation effect in aromatic system. The annealtion effect is partial loss of aromatic character due to the sharing of electron in polycyclic system. The annelation effect in chemistry refers to the stabilization or destabilization that occurs when a ring is fused to another molecule. This effect is primarily observed in aromatic compounds and is influenced by factors such as ring size, aromaticity, and the nature of the fused rings. Aromaticity: The annelation effect is particularly pronounced in aromatic compounds. Fusing a ring to an aromatic system can either enhance or diminish its aromaticity. Ring Size: The size of the fused ring plays a crucial role. Fusing a five-membered or six-membered ring to an aromatic system generally leads to stabilization, while fusing larger or smaller rings can result in destabilization. Nature of Fused Rings: The electronic properties of the fused rings also influence the annelation effect. Electron-rich fused rings tend to stabilize the aromatic system, while electron-deficient rings can destabilize it. Cases of annelation effect: Naphthalene: When a benzene ring is fused to another benzene ring to form naphthalene, the resulting molecule is more stable than two isolated benzene rings. This is due to the delocalization of electrons over the entire fused system. Anthracene: Fusing another benzene ring to naphthalene results in anthracene, which is also more stable than its constituent benzene rings. However, the stabilization is not as significant as in naphthalene due to the increased steric hindrance between the fused rings. Phenanthrene: Fusing a benzene ring to a different position of naphthalene leads to phenanthrene, which is less stable than naphthalene. This is because the fusion introduces some strain into the molecule. Factors influencing the annelation effect: Resonance stabilization: The delocalization of electrons through resonance contributes to the stability of fused aromatic systems. Angle strain: The angles between bonds in fused rings can deviate from the ideal 120° angle, leading to strain and destabilization. Steric hindrance: Bulky substituents on the fused rings can hinder rotation and increase steric repulsion, destabilizing the molecule. This video is part of one minute chemistry series. Enjoy Quick learning. For business queries, send message to suviganu@gmail.com with your phone number . We will call you back. Office Address Dr. B. Ganesh Kumar, 1255, Third street, Asari Colony, Satchiyapuram, Sivakasi- 626124 Tamil Nadu, India. Subscribe to my YouTube channel: https://www.youtube.com/c/OneChemistry?sub_confirmation=1 Content Creation: Prof. GKR Please feel free to give comments and feedback. __________________________________________________________________________ The creator of this channel Prof. GKR, his Ph.D in Chemistry from Hyderabad Central University and cleared CSIR-JRF and NET. He is currently Associate Professor in the P.S.R Arts and Science College, Sivakasi, Tamil Nadu. ## Know One Chemistry ## Youtube : https://www.youtube.com/c/OneChemistry Facebook: https://www.facebook.com/wingsGKR/ Instagram: https://www.instagram.com/onechemistrygkr/ Twitter: https://twitter.com/OneChemistry Website: https://sites.google.com/view/suviganu/home Email: suviganu@gmail.com ___________________________________________________________________________ #chemistry #chemistryconcepts #jeeneetchemistry #organicchemistry #TRB #gate #netexam #chemistrynotes #chemicalreactions #organicchemistrytricks #neet #jee #setexam #setexampreparation #netexampreparation #gateexam #gateexampreparation #netexampreparation #neetexam #neetchemistry #neetchemistrypreparation #gatechemistry #netchemistry #ugcchemistry #jee #jeechemistry #jeechemistryquestions #jamchemistry The content may help you to clear UPSC Chemistry CSIR Chemical Science UGC Chemical Science GATE Chemistry NET Chemical Science NEET Chemistry JAM Chemistry TNPSC Chemistry TRB CHEMISTRY JEE Chemistry