The decreasing order of reactivity of the following alkenes is:
(i) 2,3-Dimethyl-2-butene
(ii) 2-Methyl-2-butene
(iii) 2-Butene
(iv) Ethene

(iv) > (iii) > (ii) > (i)

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(i) > (ii) > (iii) > (iv)

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(iv) > (ii) > (iii) > (i)

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(i) > (iii) > (ii) > (iv)

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Solution

The correct option is B (iv) > (iii) > (ii) > (i)
Less substituted alkenes are less stable and hence more reactive.
So the decreasing order of reactivity is as shown.

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