Which of the following structures possesses a cross-conjugated system?

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

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

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

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

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Solution

The correct option is D $C H_{2} = C H - C | = C H = C H_{2} C H_{2}$
From the given options, only the above compound has conjugations in $3$ carbon chains. One conjugation is in the chain form $C_{1}$ to $C_{4}$ , other two are in chains from $C_{1}$ to $C_{3}$ and $C_{4}$ to $C_{5^{'}}$ respectively. Hence, it is cross- conjugated system.

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Similar questions

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}

A g N O_{3}

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

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C H_{2} = C H - C H = C H - \oplus N H_{3}

\oplus C H_{2} - C H = C H - ⊖ C H - \oplus N H_{3}

\oplus C H_{2} - C H = C H - C H = N H_{3}

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