The rate of dehydrohalogenation of the given compounds follows the order:

(iii) > (i) > (ii)

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(ii) > (iii) > (i)

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(ii) > (i) > (iii)

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(iii) > (ii) > (i)

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Solution

The correct option is C (ii) > (i) > (iii)
For identical carbon chain, the rate of dehydrohalogenation is: iodide > bromide > chloride, as leaving tendency of halide ions decreases as $I^{-} > B r^{-} > C l^{-}$ .

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