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- #Organic chemistry- some basic principles and techniques
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Energy of resonance hybrid is equal to the average of energies of all canonical forms.
Reason (R): Resonance hybrid cannot be presented by a single structure.
(i) Both A and R are correct, and R is the correct explanation of A.
(ii) Both A and R are correct, but R is not the correct explanation of A.
(iii) Both A and R are not correct.
(iv) A is not correct but R is correct.
Answers (1)
The answer is the option (iv) A is not correct, but R is correct.
Explanation: Canonical structures always have more energy as compared to the resonance hybrid, and so the Resonance hybrids are always more stable than any of the canonical structures. The delocalisation of electrons lowers the orbitals energy in case of resonance hybrid and gives stability.
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