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  4. The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

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Q. The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

NTA AbhyasNTA Abhyas 2022

Solution:

Both aldoses (glucose) and fructose can reduce Tollen’s reagent. So option $\left(\right.D\left.\right)$ is correct.
In other options only $1$ can do it for example in option $\left(\right.a\left.\right)$ glucose, in option $\left(\right.b\left.\right)$ fructose and option $\left(\right.c\left.\right)$ only hexanal. Fructose can reduce Tollen's reagent due to its enolisation.