Which of the following pairs are not resonating structures?

H - C = \oplus N H; H - \oplus C = ¨ N H

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C H_{3} - C H = C H - C H_{3}; C H_{3} - C H_{2} - C H = C H_{2}

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C H_{3} - C | O^{\oplus} = C H - C | | O - C H_{3}; C H_{3} - C | | O - ⊖ C H - C | | O - C H_{3}

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All the above

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Solution

The correct option is D $C H_{3} - C H = C H - C H_{3}; C H_{3} - C H_{2} - C H = C H_{2}$
Resonance is a way of describing decocalized electrons with in certain poly atomic molecules and the imaging canonical structures are called resonance structures.
${C H}_{3} - C H = C H - {C H}_{3}; {C H}_{3} - {C H}_{2} - C H = {C H}_{2}$
there is no conjugation, So, resonance is not possible.
Ans :- B

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I . ⊖ C H_{2} - \oplus C H - C H = C H - O - C H_{3}

I I . ⊖ C H_{2} - C H = C H - \oplus C H - O - C H_{3}

I I I . C H_{2} = C H - ⊖ C H - \oplus C H - O - C H_{3}

I V . C H_{2} = C H - ⊖ C H - C H = \oplus O - C H_{3}

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

C H_{3} - C H = C H - C H_{2} - O | | C - C H_{3} \to C H_{3} - C H = C H - C H_{2} - O | | C - O H

C H_{2} = C H - . . N H - C H_{3}

C H_{2} = C H - . . O . . - C H_{3}

C H_{2} = C H - . . O . . - C H = C H_{2}

C H_{2} = C H - N H_{2}

C H_{3} - C H_{3}, C H_{2} = C H_{2}

C H \equiv C H

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

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