Qualitative Tests for Carbohydrates

Question 1

For carbohydrates in general

Answer 1

Molisch
Anthrone

Question 2

For starch

Answer 2

Iodine

Question 3

For reducing sugars

Answer 3

Benedict’s
Barfoed’s
Tollen’s

Question 4

For pentoses

Answer 4

Bial’s
Phloroglucinol

Question 5

For ketoses

Answer 5

Seliwanoff’s

Question 6

For several monosaccharides

Answer 6

Phenylhydrazine

Question 7

For galactose

Answer 7

Mucic acid

Question 8

Reagent of Iodine

Answer 8

Iodine

Question 9

Reagent of Molisch

Answer 9

alpha-naphthol

Question 10

Reagent of Anthrone

Answer 10

Anthrone

Question 11

Reagent of Benedict’s

Answer 11

Cupric ions in basic medium

Question 12

Reagent of Barfoed’s

Answer 12

Cupric ions in acidic medium

Question 13

Reagent of Tollen’s

Answer 13

Silver nitrate

Question 14

Reagent of Bial’s

Answer 14

Orcinol

Question 15

Reagent of Phloroglucinol

Answer 15

Phloroglucinol

Question 16

Reagent of Seliwanoff’s

Answer 16

Resorcinol

Question 17

Reagent of Phenylhydrazine

Answer 17

Dinitrophenylhydrazine

Question 18

Reagent of Mucic Acid

Answer 18

Nitric acid

Question 19

Result of Iodine

Answer 19

Violet

Question 20

Result of Molisch

Answer 20

Violet ring

Question 21

Result of Anthrone

Answer 21

Dark green

Question 22

Result of Benedict’s

Answer 22

Brick red

Question 23

Result of Barfoed’s

Answer 23

Brick red

Question 24

Result of Tollen’s

Answer 24

Silver mirror

Question 25

Result of Bial’s

Answer 25

Blue green

Question 26

Result of Phloroglucinol

Answer 26

Red

Question 27

Result of Seliwanoff’s

Answer 27

Cherry red

Question 28

Result of Phenylhydrazine

Answer 28

Osazone crystals

Question 29

Result of Mucic Acid

Answer 29

Insoluble crystals