Structural formulas (A) to (F) of species with the formula HNCO (isocyanic acid, its contributors and its isomers) are given below.
Which of the structures is a resonance contributor of isocyanic acid, $H - N = C = O$ ?

Question

Structural formulas (A) to (F) of species with the formula HNCO (isocyanic acid, its contributors and its isomers) are given below.

Which of the structures is a resonance contributor of isocyanic acid, $H - N = C = O$ ?

resonance structures HNCO

TestHub · Accepted Answer

C ( O − − C ≡ N + − H ) keeps the atom order H − N − C − O and differs from A only by electron shifts. E ( N ≡ C − OH ) has H on O and F ( HC ≡ N + − O − ) has H on C, so they are isomers, not contributors.

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