Answer
D
Work Step by Step
Bond length decreases with bond order,
$NO_3^-$: 4 bonds, 3 atoms, b.o. =1.33
$NO^+$: 3 bonds, 1 atom, b.o. =3
$NO_2^-$: 3 bonds, 2 atoms, b.o. =1.5
$H_2NOH$: 1 bond, 1 atom, b.o. =1
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