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Assertion (A) . Energy of resonance hybr...

Assertion (A) . Energy of resonance hybrid is equal to the average of energines of all canonical forms.
Reason (R). Resonance hybrid cannot be presented by a single structure.

A

Both A and R are correct and R is the correct explanation of A

B

Both A and R are correct but R is not the correct explanation of As

C

both A and R are not correct

D

A is not correct but R is correct

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion and reason question, we will analyze both the assertion (A) and the reason (R) step by step. ### Step 1: Understanding the Assertion The assertion states that "the energy of resonance hybrid is equal to the average of energies of all canonical forms." **Explanation:** - Resonance hybrid refers to the actual structure of a molecule that is a blend of multiple resonance forms (canonical structures). - The energy of the resonance hybrid is not simply the average of the energies of the canonical forms. Instead, it is influenced more by the stability of each canonical form. The more stable the canonical form, the greater its contribution to the resonance hybrid. ### Step 2: Evaluating the Assertion Based on our understanding, the assertion is incorrect because: - The energy of the resonance hybrid is lower than the average energy of the canonical forms due to the stabilization from electron delocalization. ### Step 3: Understanding the Reason The reason states that "resonance hybrid cannot be presented by a single structure." **Explanation:** - This statement is correct. A resonance hybrid is a representation of a molecule that cannot be accurately depicted by any single canonical structure. Instead, it is a combination of all possible structures. ### Step 4: Evaluating the Reason Since the reason correctly explains the nature of resonance hybrids, we conclude that: - The reason is true. ### Conclusion - The assertion (A) is incorrect. - The reason (R) is correct. Thus, the final answer is that the assertion is false, while the reason is true. ### Final Answer - Assertion (A) is false. - Reason (R) is true.

To solve the assertion and reason question, we will analyze both the assertion (A) and the reason (R) step by step. ### Step 1: Understanding the Assertion The assertion states that "the energy of resonance hybrid is equal to the average of energies of all canonical forms." **Explanation:** - Resonance hybrid refers to the actual structure of a molecule that is a blend of multiple resonance forms (canonical structures). - The energy of the resonance hybrid is not simply the average of the energies of the canonical forms. Instead, it is influenced more by the stability of each canonical form. The more stable the canonical form, the greater its contribution to the resonance hybrid. ...
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