Question

Select the incorrect statements(s) :

• A. In $N_2{F}_4$, d-orbitals are contracted by electronegative fluorine atoms, but it is not possible in $N_2{H}_4$.
• B. The N - N bond energy in $N_2{F}_4$ is more than N - N bond energy in $N_2{H}_4$
• C. The N - N bond length in $N_2{F}_4$ is more than $N_2{H}_4$
• D. The N - N bond length in $N_2{F}_4$ is less than that of $N_2{H}_4$

Answer 1

Answer: (A), (B), (C)

The correct options are
A In $N_2{F}_4$, d-orbitals are contracted by electronegative fluorine atoms, but it is not possible in $N_2{H}_4$.
B The N - N bond energy in $N_2{F}_4$ is more than N - N bond energy in $N_2{H}_4$
C The N - N bond length in $N_2{F}_4$ is more than $N_2{H}_4$

Neither ‘N’ or ‘F’ contain d-orbitals and in $N_2{F}_4$, N - N bond is shorter than in $N_2{H}_4$ due to s-character.