Catalyzes the formation of chlorobenzoyl-CoA via a 2 step reaction. First 4-chlorobenzoate is adenylated by ATP, followed by acyl transfer from the 4-chlorobenzoyl-AMP intermediate to CoA (By similarity). Benzoate, 4-bromobenzoate, 4-iodobenzoate and 4-fluorobenzoate also act as substrates. Inactive towards 4-nitrobenzoate. 4-chlorobenzoate + ATP + CoA = 4-chlorobenzoyl-CoA + AMP + diphosphate Optimum pH is 7.0. Optimum temperature is 25 degrees Celsius. Xenobiotic degradation; 4-chlorobenzoate degradation; 4-hydroxybenzoate from 4-chlorobenzoate: step 2/3. Homodimer. Belongs to the ATP-dependent AMP-binding enzyme family.