Which of the following resonating structures of 1-methoxy-1, 3-butadiene is least stable ? (1) \...

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Which of the following resonating structures of 1-methoxy-1, 3-butadiene is least stable ?
(1) \( \stackrel{\odot}{\mathrm{CH}_{2}}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\stackrel{\oplus}{\mathrm{O}-\mathrm{CH}_{3}} \)
(2) \( \mathrm{CH}_{2}=\mathrm{CH}_{2}-\stackrel{\odot}{\mathrm{CH}}-\mathrm{CH}=\stackrel{\oplus}{\mathrm{O}}-\mathrm{CH}_{3} \)
(3) \( \stackrel{\Theta}{\mathrm{CH}_{2}}-\stackrel{\oplus}{\mathrm{CH}}-\mathrm{CH}=\mathrm{CH}-\mathrm{O}-\mathrm{CH}_{3} \)
(4) \( \mathrm{CH}_{2}=\mathrm{CH}-\stackrel{\odot}{\mathrm{CH}}-\stackrel{\oplus}{\mathrm{CH}}-\mathrm{O}-\mathrm{CH}_{3} \)
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