Write a structural formula for each of the following compounds:
(a) 2-Phenylbutanoyl chloride
(b) 2-Phenylbutanoic anhydride
(c) Butyl 2-phenylbutanoate
(d) 2-Phenylbutyl butanoate
(e) 2-Phenylbutanamide
(f) N-Ethyl-2-phenylbutanamide
(g) 2-Phenylbutanenitrile