Write a structure for each of the following compounds:
a. N,N-dimethylhexanamide
b. 3,3-dimethylhexanamide
c. Cyclohexanecarbonyl chloride
d. Propanenitrile
e. Propionyl bromide
f. Sodium acetate
g. Benzoic anhydride
h. β-valerolactone
i. 3-methylbutanenitrile
j. Cycloheptanecarboxylic acid