Pls answer this question..

Pls answer this question.. Which Of the following molecule Contains ? (A) NOF (D) NH,OH

Dear Student,
NO2 - has shortest N-O bond. It has one negative charge which makes two resonating structures. Both N-O bonds acquire partial double bond character. As one negative charge is making pi bonds alternatively between two N-O toms. We can say each N-O bond has 0.5 pi bond contribution between the atoms. In case of NO3- same charge is shared between three N-O bonds. Thus pi bond contribution is 0.33 for each bond. So N-O bond is shorter in NO2-. Rest two molecules have single bond between N and O. So they have even longer N-O bonds. So the correct answer is option b.
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