Select the correct statement about ${\mathrm{N}}_2{\mathrm{F}}_4$ and ${\mathrm{N}}_2{\mathrm{H}}_4$.

In ${\mathrm{N}}_2{\mathrm{F}}_4$ $\mathrm{d}$-orbitals are contracted by electronegative $\mathrm{F}-$atoms but $\mathrm{d}$-orbital contraction is not possible by H atom in ${\mathrm{N}}_2{\mathrm{H}}_4$.

$N-N$ bond energy in ${\mathrm{N}}_2{\mathrm{F}}_4$ is greater than $\mathrm{N}-\mathrm{N}$ bond energy in ${\mathrm{N}}_2{\mathrm{H}}_4$.

$\mathrm{H}-\widehat{\mathbf{N}}-\mathrm{H}$ bond angle in ${\mathrm{N}}_2{\mathrm{H}}_4$ is less than $\mathrm{F}-\widehat{\mathrm{N}}-\mathrm{F}$ angle of ${\mathrm{N}}_2{\mathrm{F}}_4$.

The $\mathrm{N}-\mathrm{N}$ bond length in ${\mathrm{N}}_2{\mathrm{F}}_4$ is more than that in ${\mathrm{N}}_2{\mathrm{H}}_4$