Sucrose Formation via Condensation Steps:

• Sucrose is a disaccharide formed from one glucose and one fructose unit.
• The reaction involves a glycosidic bond between C1 of α-glucose and C2 of fructose, releasing H₂O.
• Correct notation shows α-glucose providing -OH and fructose providing -H.
• Verify anomers and water loss to match the standard structure.

Why A is correct:

• It accurately depicts the condensation of α-D-glucose (anomeric OH) and α-D-fructose (anomeric H) to form sucrose with H₂O loss, per the α-1,2-glycosidic linkage definition.

Why the others are wrong:

• B uses two glucose units (maltose, not sucrose) and adds H₂O (hydrolysis, not formation).
• C specifies β-fructose but incorrectly adds H₂O instead of subtracting it.
• D omits fructose anomer specification, mismatching the precise α-fructose required for sucrose.

Final answer: A