The reactions of glucose with acetic anhydride suggest that it is
A. A pentahydroxy aldehyde
B. Hydrate of carbon
C. A polyhydroxy ketone
D. An alcohol

(a) Write the chemical equarions for the reactions of glucose with : (i) acetic anhydride (ii) ammonical silver nitrate solution (b) Draw simple projections of D-glucose and L-glucose (c ) What do you understable by replication by DNA ? How does DNA A differ from RNA structurally ?

Assertion (A): Deoxyribose, C_5 H_(10)O_(4) is not a carbohydrate. Reason (R): Carbohydrates are optically active polyhydroxy aldehyde or polyhydroxy ketone or substances which give aldehyde or ketone on hydrolysis.

NA (nucleophilic addition) reaction of alcohols with aldehydes gives hemiacetal, whereas phenols react with aldehydes and ketones in acidic medium and give electrophilic substitution product (I) , which further reacts with phenol to give (II) , Explain.

An unknown aldehyde A on reaction with alkali gives a beta - hydroxy aldehyd, which loses water to form an unsaturated aldehyde, But-2-enal. Another aldehyde 'B' disproporationation reaction in the presence of conc, alkali to form products C and D. C is an aryl alcohol wit the formula ( C_(2)H_(8)) (1) Identify A and B. (ii) Write the sequence of reactions involved. (iii) Name the product, when B reacts with Zn amalgam and hydrochloric acid.

D-glucose is treated with an excess of acetic anhydride in the presence of pyridine. Identity the products formed