Cellulose upon acetylation with excess acetic | vedclass

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(A) Cellulose is a linear polymer of $\beta-D$-glucose units joined by $\beta-1,4$-glycosidic linkages. Each glucose unit in cellulose contains three

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(A) Cellulose is a linear polymer of $\beta-D$-glucose units joined by $\beta-1,4$-glycosidic linkages. Each glucose unit in cellulose contains three hydroxyl $(-OH)$ groups (at $C_2, C_3,$ and $C_6$ positions). Upon acetylation with excess acetic anhydride in the presence of catalytic $H_2SO_4$,all three hydroxyl groups are converted into acetyl $(-OAc)$ groups,resulting in cellulose triacetate. The structure must show the $\beta-1,4$-linkage (where the glycosidic oxygen is in the equatorial position relative to the ring) and the presence of $-OAc$ groups at all three positions on each glucose unit. Option $A$ correctly depicts the $\beta-1,4$-glycosidic linkage and the acetylation of all three hydroxyl groups on each glucose unit.

Cellulose upon acetylation with excess acetic anhydride $/$ $H_2SO_4$ (catalytic) gives cellulose triacetate whose structure is

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