Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution ?
Option: 1

Option: 2

Option:3
              
Option:4   

Answers (1)

Sugar that have an aldehyde, a ketone, a hemiacetal or a hemiketal or a hemiketal group is able to reduce an oxidising agent, These sugar are classified as reducing sugars.

Hemiacetal can be easily reduced by oxidising agent such as Tollen's reagent

Therefore, option(3) is correct.

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