Which one of the following nitro-compounds does not react with nitrous acid?

Nitro compounds that contain acidic hydrogen react with nitrous acid. Here, in this molecule no acidic hydrogen is present. Therefore, it does not react with nitrous acid. All other given compounds contain the acidic hydrogens.

No acidic $\mathrm{H}-$atom on the carbon atom having ${\mathrm{NO}}_2-$group.