In which of the following delocalisation of \( \pi \)-electron is possible.....
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0In which of the following delocalisation of \( \pi \)-electron
\( \mathrm{P} \)
is possible.
(1) \( \mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{CHO} \)
(2) \( \mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}=\mathrm{O} \)
(3)
(4) \( \mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}_{2} \)
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