HNCO (isocyanic acid) has following resonating structures: H−N=C=OI↔H−⊖N−C≡⊕OII↔H−⊕N≡C−⊖OIII The order of stability is:
A
I>III>II
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B
I>II>III
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C
II>III>I
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D
II>I>III
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Solution
The correct option is AI>III>II H−N=C=OI(Uncharged speciesis most stable)H−⊕N≡C=⊖OIII(-ve charge is morestable on high E.N. atom)H−⊖N=C=⊕OII(-ve charge is less stable on less E.N. atom)
Negative charge on the more electronegative element and positive charge on more electropositive element is comparatively more stable.