Structural formulas (A) to (F) of species with the formula HNCO (isocyanic acid, its contributors and its isomers) are given below.
Which structure has a carbon atom with only six electrons in its valence shell ?

Question

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

Which structure has a carbon atom with only six electrons in its valence shell ?

resonance structures HNCO

TestHub · Accepted Answer

In D the carbon has three bonds (one to O − , a double bond to N) and a + charge, so it has a sextet. In A, B, C, E and F every atom has an octet.

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