Unlike phenol , 2,4-dinitrophenol is soluble in sodium carbonate solution in water because

Explanation

The presence of two electron withdrawing `-NO_(2)` groups in the ting at the ortho and para positions makes 2, 4-dinitrophenol a stronger acid than phenol. It therefore, reacts with aqueous sodium carbonate to form corresponding sodium salt which is soluble. but phenol being a weaker acid does react with aqueous sodium carbonate. For more details, consilt section 16.