Write a chemical reactions to elucidate
Glucose contains five - OH groups.

Explanation

(a) (i) Acetylation of glucose with acetic anhydride gives glucose pentaacetate which confirms the presence of five OH groups.
or
Glucose + Acetic anhydride `rarr` Penta-acetyl glucose
(ii) When glucose heated with HI, it forms n-hexane, suggesting that all six carbon atoms are linked in a straight chain.
or
Glucose + HI/red `P rarr n`-Hexane
(b) Denaturatio is loss biological activity of a protein.
Or
Secondary and tertiary structure of protein is destroyed due to heating and pH change.
Eg : The coagulation egg on heating, curdling of milk by bacteria.
(c ) `beta-D-2` deoxyribose OR deoxyribose