Which one of the following substrate will be the most reactive for \( \mathrm{E}_{1} \) reaction...

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Which one of the following substrate will be the most reactive for \( \mathrm{E}_{1} \) reaction?
(a)
(b)
(c) \( \mathrm{Br}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \)
(d)
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