Reasoning Question Series:
Q.No.33:How can we recognise systems that are aromatic ?#Ans: By applying the criteria for aromaticity outlined below.
Q.No.33:How can we recognise systems that are aromatic ?#Ans: By applying the criteria for aromaticity outlined below.
Based on the properties of aromatic compounds, there are FOUR criteria about the π system that need to be met inorder for the "special" aromatic stabilisation to be observed:
#Conjugated : there needs to one "p" orbital from each atom in the ring, so each atom must be either sp2 or sp hybridised.
#Cyclic : linear systems are not aromatic, all atoms in the ring must be involved in the π system (i.e. no sp3 atoms)
#Planar : if the ring is planar flat then this means there is good overlap / interaction between the "p" orbitals....not always easy to consider.
#The Huckel Rule..... 4n+2 π electrons in the cyclic conjugated π system (n = 0, 1, 2, 3 etc.) This is equivalent to an odd number of π-electrons pairs).
Malik Xufyan
#Conjugated : there needs to one "p" orbital from each atom in the ring, so each atom must be either sp2 or sp hybridised.
#Cyclic : linear systems are not aromatic, all atoms in the ring must be involved in the π system (i.e. no sp3 atoms)
#Planar : if the ring is planar flat then this means there is good overlap / interaction between the "p" orbitals....not always easy to consider.
#The Huckel Rule..... 4n+2 π electrons in the cyclic conjugated π system (n = 0, 1, 2, 3 etc.) This is equivalent to an odd number of π-electrons pairs).
Malik Xufyan
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