Which from following compounds does NOT contain oxygen as heteroatom?

Step-by-step solution

Identification of compounds without oxygen heteroatoms: Among the given options, pyrrole contains nitrogen as the sole heteroatom and lacks oxygen entirely. Furan features an oxygen heteroatom in its five-membered aromatic ring structure C₄H₄O . Tetrahydrofuran contains oxygen in its saturated five-membered ring C₄H₈O . 4H-Pyran incorporates oxygen in its six-membered ring structure C₅H₆O . Pyrrole C₄H₅N contains nitrogen as its heteroatom without oxygen participation. Since pyrrole is the only compound devoid of o