Identify the molecular formula of Furan:

Explanation

Option A is correct. The molecular formula of furan is C4H4O. Furan is a heterocyclic aromatic compound characterized by a five-membered ring comprised of four carbon atoms and one oxygen atom. The oxygen atom is part of the ring structure, contributing to its aromatic properties. Furan has applications in the production of various chemicals, including plastics and pharmaceuticals, and is recognized for its distinctive odor. Option B is incorrect because C5H3O corresponds to furfural, which is a derivative of furan but not the molecular formula for furan itself. Option C is incorrect as C4H5O is the molecular formula for cyclobutanol, a cyclic alcohol, and does not describe furan. Option D is incorrect because C4H3O is not a valid molecular formula for any stable compound, as it suggests that a carbon atom would have fewer than four bonds, which violates the octet rule.