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

• The nitro compound has alpha hydrogen, and it reacts with nitrous acid. This reaction is used to distinguish between primary, secondary, and tertiary nitro compounds.
• Primary nitroalkanes have alpha hydrogen, alpha hydrogen reacts with nitrous acid to form nitroso nitroalkane.
• Secondary nitroalkanes also have alpha hydrogen 
• Tertiary nitroalkane do not have alpha hydrogen, so they do not react with nitrous acid. 

Therefore, option C is correct.