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Resonance Effect

Which of the ...

Question

Which of the following is not the pair of resonance structures?
$I . H N = C = O \leftrightarrow H - O - C \equiv N$
$I I . ¯ N = C = O \leftrightarrow N \equiv C - O^{-}$
$I I I . C H_{3} - O | | C - ¯ C H_{2} \leftrightarrow C H_{3} -^{-} C = C H_{2}$
$I V . C H_{3} - O | | C - C H_{3} \leftrightarrow C H_{3} - O H | C = C H_{2}$

A

I and II

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B

I and IV

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C

I and III

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D

II and IV

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Solution

The correct option is B I and IV
In both I and IV, position of atoms have been changed which is not allowed in resonance.

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Similar questions

Q. Which of the following is not the pair of resonance structures?

I . H N = C = O \leftrightarrow H - O - C \equiv N

I I . ¯ N = C = O \leftrightarrow N \equiv C - O^{-}

I I I . C H_{3} - O | | C - ¯ C H_{2} \leftrightarrow C H_{3} -^{-} C = C H_{2}

I V . C H_{3} - O | | C - C H_{3} \leftrightarrow C H_{3} - O H | C = C H_{2}

Q. The order of stability of the following tautomeric compounds is:

C H_{2} = O H | C - C H_{2} - O | | C - C H_{3} ⇌ C H_{3} - O | | C - C H_{2} - O | | C - C H_{3} ⇌ C H_{3} - O H | C = C H - O | | C - C H_{3}

I

I I

I I I

C H_{2} = O H | C - C H_{2} (I) - O | | C - C H_{3} ⇌ C H_{3} - O | | C - C H_{2} (I I) - O | | C - C H_{3}

⇌ C H_{3} - O H | C = C H (I I I) - O | | C - C H_{3}

The order of stability of the following tautomeric compounds is:

Q. Formic acid is considered as a resonance hybrid of the four structures Which of the above order is correct for the stability of the four contributing structures :

H - O | | C - O H \leftrightarrow H - O^{-} | C = + O H \leftrightarrow H -^{-} O - H \leftrightarrow H -^{+} O - H

I

I I

I I I

I V

Q. Arrange the following compounds in decreasing order of reactivity towards nucleophilic addition reaction.

C H_{3} - O | | C I - C H_{3}

C H_{3} - O | | C I I - C l

C H_{3} - O | | C I I I - N H_{2}

C H_{3} - O | | C I V - O H

C H_{3} - O | | C - O V - O | | C - C H_{3}

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Resonance Effect

Standard XII Chemistry

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