The most important condition for resonance to occur is that the involved atoms in resonating str...

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The most important condition for resonance to occur is that the involved atoms in resonating structure must be coplanar or nearly coplanar for maximum delocalisation. If this condition does not fulfil, involved orbitals cannot be parallel to each other and as a consequence delocalisation cannot occcur. Bulky groups present on adjacent atoms inhibit the of orbitats. This phenomenon is known as steric inhibition of resonance. Steric inhibition of resonance has profound effect on
- (1) Physical properties
(2) Acidity and basicity
(3) Reactivity of organic compounds
Consider the following two structures and choose the correct statements -
(I)
(II)
(A) carbon-nitrogen bond length structure I is greater than that in structure II
(B) carbon-nitrogen bond length in structure I is less than in structure II
(C) carbon-nitorogen bond length in both structure is same
(D) It can not be compared
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