Draw the product formed when pentanoic anhydride [(CH$_3$CH$_2$CH$_2$CH$_2$CO)$_2$O] is treated with each reagent. With some reagents, no reaction occurs.
a. SOCl$_2$
b. H$_2$O
c. CH$_3$OH
d. NaCl
e. (CH$_3$CH$_2$)$_2$NH (excess)
f. CH$_3$CH$_2$NH$_2$ (excess)