Final answer:
The incorrect pairing is CN VI: Trochlear; CN VI should be paired with the Abducens nerve. The facial nerve (CN VII) contains preganglionic parasympathetic fibers, and mnemonics can help remember the functions of different cranial nerves.
Step-by-step explanation:
The incorrect pairing of cranial nerve number and name from the provided options is CN VI: Trochlear. Correctly, CN VI is the Abducens nerve, which is responsible for eye movement, specifically abducting the eye. CN IV is the Trochlear nerve, which also deals with eye movement, particularly the movement of the eyeball downward and laterally. Since the question also asks which cranial nerve contains preganglionic parasympathetic fibers, of the given options, the facial nerve (CN VII) contains these fibers, as they innervate several glands including the lacrimal, salivary, and mucous glands in the nose and palate.
Moreover, understanding the functional roles of cranial nerves can be aided by mnemonics such as "Some Say Marry Money But My Brother Says Brains Beauty Matter More," which corresponds to whether the nerves are sensory, motor, or both. The glossopharyngeal nerve (CN IX) and the vagus nerve (CN X) are associated with the Otic ganglion and the Ciliary, Pterygopalatine, and Submandibular ganglions, respectively, for their parasympathetic functions.