Question

7. Trehalose contains two a-glucose units linked by a (1-1) glycosidic bond. Draw its structure as a Haworth formulation.

Answer 1

Solutions 9.No.7:- The Haworth preojo formulation of Trehalose is gie shown below CH₂OH 1/ OH HOH₂C OM TETER W ou l-Iglycosidic 1 bond. 4 LT d-Glucose unit X-Glucose unit Q.No.3:- Benedict's tet test is used to test reducing sugars : It is done by treating a reducing sugar like glucóse with Benedicts? reagent. Benedict's reagent contains forowing three reagents Ciso, 5420 + Na₂CO3 + Nag Cols Oy. Copper sulfate Sodium sodium pentahydrate . Carbonate cabrate. A blue coloured solution, he

Reducing sugars are those which have free aldehyde or ketone groups. When n'a reduéine sugar is treated with Benedict's reagent, the blue colour of Benedict's reagent tumet turns yellowish red. In this reaction, the Cupsicions in Benedict's reagent get reduced to cuprous ions (cuprous oxide). C - Aldehyde Cuid? + . : Cuzo Cupric : Ŕ n . É on Cuprous oxid ions Carboxylic Brick-red or adid yellowish red to ppt If Benedict's Test is positive, then the sugar is a reducing - sugar. 8.No.4:- Tollen's test, also known as silver-mirror test, is a test to distinguish between an aldehyde and a Refore. It uses the fact that aldehydes are readily oxidized as compared to ketones. Yollen's reaper't is colourless, basie, aqueous solution containing silver ions coordinated to ammonica (Ag (NH3)2+). Tollen's reagent oxidises an oldehyde into the corresponding carboxyl acid.. + 2Ag +201 Cuais + 2Ag + H20 ou 0 2 it means the reactant If the tollen's test is positive, then under test is an aldehyde