Which of the following pairs give positive Tollens test?

Options

A. Glucose, Sucrose
B. Glucose, fructose
C. Hexanal, acetophenone
D. Fructose,sucrose

Answer

B

Explanation

Glucose is an aldehyde, gives positive Tollens test. Fructose although ketone gives positive Tollens test because under the basic conditions of the reagent, fructose undergoes a rearrangement to form glucose and mannose `(C-2 "epimer of glucose")`.