Mark the correct order of decreasing acid strength of the following compounds.
| (I) |  |
(II) |  |
| (III) |  |
(IV) |  |
| (V) |  |
1. (V) > (IV) > (II) > (I) > (III)
2. (II) > (IV) > (III) > (I) > (V)
3. (IV) > (V) > (III) > (II) > (I)
4. (V) > (IV) > (III) > (II) > (I)
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