The Seliwanoff\'s Test is a test for ketoses. Of those you listed, only fructose is going to react right away. \"sucrose\" may react if one lets it sit too long because of hydrolysis. Solution The Seliwanoff\'s Test is a test for ketoses. Of those you listed, only fructose is going to react right away. \"sucrose\" may react if one lets it sit too long because of hydrolysis..