Question

Experiment 33 PART B. SOME REACTIONS OF CARBOHYDRATES Spor Test Results with Carbohydrates Sucrose Carbohyd- Starch Fructose Glucose rate class Benedict's test Fehling's test Tollens test Glucose oxidase test Iodine test What class of carbohydrate can be expected to give a positive test with the spot tests below? Benedict's glucose oxidase Fehling's iodine Tollens Hydrolysis of polysaccharides Test Results Results of Result from Benedict's test strips Solution Result from iodine test Initial starch Initial sucrose Initial cellulose Final starch Final sucrose Final cellulose 1. Which carbohydrate(s) give "a reducing sugar" after hydrolysis? 2. Which of the initial carbohydrates give(s) glucose after hydrolysis? 3. Was the starch completely hydrolyzed after 30 min of heating? How can you tell? 4. Write the reaction for the acid catalyzed conversion in water of sucrose to glucose and fructose.

Answer 1

a spot test results with carbohydrates Glucose fructuße sucrose starch carbohydrate Briskered) . class 3. was the starch completely hydrolysed after so hien of heating a How can you tell Ans: No, even after att starch with i? wont unleago complete hydrolysis. Benedict's best * Resducing sugat reducing S4901 Fehling's test Vollens test X Reducing Sugar "T Glucose oxidase 1 x Reducing sugar! test 1 Todine v Non-reducing bluecdaut Sugar, Polysacclal tides What class of carbohydrates can be expeckd to give a positive test with the spot tests below's 4. corile the reaction for the acid Catalysed conversion in Wales of sucrose to gluege and faclore Ans: C2H22:11 + H₂o Hell Ch 6 + Cat126 D-Glucose . D-fructose sucrose Benedia's - shocoße oxidase refling's a iodine - Tollens - Slucose, fructose Glucose Glucose, fructose starch glucose Fuclose Hydrolysis of results Schistick polysacchoonides - Test Result's of Bandil's Resultfoom legt ships Result from is direkt Tritial starch Initial Sucrale Iridal cellulose final starch final sucrose final cellulose 1. which carbohydrates give a reducing sugo Ans: starch, Sucrose, Cellulose a which of the initial carbohydrates gives glucose after heledysis ons n i ch, Initial Sultore, Initial celulare