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.

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

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Both A and R are not correct.

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A is not correct but R is correct.

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

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Solution

The correct option is C
A is not correct but R is correct.

Analysing the assertion :

Resonance hybrid is the real structure of a molecule which has the contribution of all canonical structures. It is not equal to the average of all canonical structures. More stable canonical structure has more contribution towards resonance hybrid and less stable canonical structure has less contribution towards resonance hybrid.

So, the assertion is wrong.

Analysing the reason :

Resonance hybrids cannot be presented by a single structure. It involves contribution from all canonical structures.

So, the reason is correct.

Hence, assertion is not correct but reason is correct.

So, option (D) is the correct answer.

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Similar questions

H_{3} P O_{3}

can be represented by structures 1 and 2 shown above. Can these two structures be taken as the canonical forms of the resonance hybrid representing

H_{3} P O_{3}

? If not, give reasons for the same.

Q. Assertion :Benzene

(C_{6} H_{6})

can be drawn as a series of resonance structures.
Reason: Its bonds are a hybrids of single and double bond character.

$H_{3} P O_{3}$ can be represented by structures 1 and 2 shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing $H_{3} P O_{3}$ ? If not, give reasons for the same.

H₃PO₃ can be represented by structures 1 and 2 shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing H₃PO₃? If not, give reasons for the same.

Q. The resonance hybrid of Ozone arises from canonical forms.

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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.

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.