The correct order of reactivity of I, II & III towards addition reactions is:

I > I I I > I I

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I > I I > I I I

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I I I > I I > I

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I I I > I > I I

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Solution

The correct option is D $I > I I > I I I$
The correct order of the reactivity of the cycloalkane towards addition reaction is:
$C y c l o p r o p a n e I > C y c l o b u t a n e I I > C y c l o p e n t a n e I I I$
Except cyclopropane and cyclobutane, all other cycloalkane are relatively inert towards addition reaction at room temperature.
These two compounds react with opening of ring. Cyclopropane undergoes addition reaction with ring fission.

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