Answer:
The order of reactivity of alkyl halides towards \[{{S}_{{{N}^{1}}}}\] reactions is :
Allylic > Tertiary > Secondary > Primary > Vinylic
Based on this, the increasing order of reactivity in different alkyl halides listed above is :
(a) (II) < (III) < (I) (b) (III) < (I) < (IV) < (II) (c) (III) < (II) < (I).
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