Cantabria PAU Biology Practice Questions - Cantabria PAU Biology Examination - UNICAN (Biología 2o Bachillerato 2026) Exam

Why does sucrose (α-D-glucopyranosyl-(1→2)-β-D-fructofuranoside) lack reducing power toward Fehling’s reagent?

Because both anomeric carbons (C1 of glucose and C2 of fructose) are involved in the glycosidic bond. Because it contains only galactose units linked by β(1→4) bonds. Because its structure completely lacks hydroxyl groups on the furanose rings. Because it denatures rapidly at room temperature, releasing carbon monoxide.

Correct Answer:

Because both anomeric carbons (C1 of glucose and C2 of fructose) are involved in the glycosidic bond.

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