27. Predict and draw the product of the following reaction and indicate if the mechanism is likely to be S$_N$1, S$_N$2, E1, E2, or E1cB.
ONa
+ CH$_3$CH$_2$I
DMF
28. Predict and draw the product of the following reaction and indicate if the mechanism is likely to be S$_N$1, S$_N$2, E1, E2, or E1cB.
I
+ CH$_3$OH
29. Predict and draw the product of the following reaction and indicate if the mechanism is likely to be S$_N$1, S$_N$2, E1, E2, or E1cB.
Br
+ CH$_3$CH$_2$ONa
CH$_3$CH$_2$OH
30. Predict and draw the product of the following reaction and indicate if the mechanism is likely to be S$_N$1, S$_N$2, E1, E2, or E1cB.
OH O
+ NaOH
H$_2$O
