Specific test for ketohexoses: (A) Selivanoff's test, (B) Osazone test, (C) Molisch test, (D) None of these
Answer is A. Selivanoff's test: this is a specific test for ketohexoses. Concentrated hydrochloric acid dehydrates ketohexoses to form furfural derivatives which condense with resorcinol to give a cherry red complex. Ref: https://en.m.wikipedia.org/wiki/Seliwanoff's_test