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Which of the following pairs of compound...

Which of the following pairs of compounds can be distinguished by using Fehling's Fehling's solution?

A

Glucose and fructose

B

Glucose and sucrose

C

Methanal and ethanal

D

Hydroxypropanone and benzaldehyde

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The correct Answer is:
B
Glucose is a hemiacetal, so in presence of a base (alkaline medium is provided by Fehling.s solution) it can develop -CHO group in the form of open chain structure which responds Fehling.s solution. Sucrose is a glycoside, i.e. its hemiacetal OH groups (one due to glucose and another due to fructose) are not free, so it can.t attain - CHO group. Hence it will not respond Fehling.s solution.
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