1.
The relative rates of the following compounds towards nucleophilic addition reaction follow the order:

I. (CH3)2CHCHO(\text{CH}_3)_2\text{CHCHO} (2-methylpropanal)

II. Cl2CHCHO\text{Cl}_2\text{CHCHO} (dichloroacetaldehyde)

III. HCHO\text{HCHO} (formaldehyde)

IV. OHC–CHO\text{OHC–CHO} (glyoxal)