help me with these please, also rank and explain the choice

1) Rank the following compounds in decreasing order of their reactivity in the Sn2 reaction with sodium ethoxide: methyl iodide; t-butyl iodide; neopentyl iodide; isopropyl iodide; ethyl iodide Explain the trend. 2) Explain what makes a sulfonate such a good leaving group. In other words, why is sulfonate such a weak base? (Hint: You should invoke one of the three stability arguments that we've used before...)