I- CH2-CH - CH - CH - -NH3II- -CH2 - CH - CH - -CH - -NH3III- -CH2-CH - CH - CH - NH3Which of these structures is not a valid canonical structure-

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Resonance Effect

I. CH2=CH -...

Question

I. $C H_{2} = C H - C H = C H - \oplus N H_{3}$
II. $\oplus C H_{2} - C H = C H - ⊖ C H - \oplus N H_{3}$
III. $\oplus C H_{2} - C H = C H - C H = N H_{3}$
Which of these structures is not a valid canonical structure?

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III

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None of these

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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_{2} = C H - C H = C H - + C H_{2}

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

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

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

C = C

C H_{2} = C H - C H = O I ⟷ \oplus C H_{2} - C H = C H - ⊝ O I I

C H_{2} = C H - C \equiv C H

C H \equiv C - C \equiv C H

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

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

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