Final answer:
The word 'disinfectant' has four syllables, with each vowel sound representing a separate syllable.
Step-by-step explanation:
The word disinfectant has four syllables: dis-in-fec-tant. To determine the number of syllables, you can look at vowel sounds; each vowel sound typically corresponds to one syllable. In this case, 'dis', 'in', 'fec', and 'tant' each represent a different vowel sound, making it four syllables in total.