Advertisements
Advertisements
Question
Give two evidences for presence of formyl group in glucose.
Advertisements
Solution
- Glucose gets oxidized to a six-carbon monocarboxylic acid called gluconic acid on reaction with bromine water which is a mild oxidizing agent. Thus, the carbonyl group in glucose is in the form of formyl (–CHO).
- Hemiacetal group of glucopyranose structure is a potential aldehyde (formyl) group. It imparts reducing properties to glucose. Thus, glucose gives positive Tollen’s test or Fehling test.
APPEARS IN
RELATED QUESTIONS
Give scientific reasons:
Hydrolysis of sucrose is called inversion.
Draw a neat diagram for the following:
Haworth formula of maltose
The glycosidic linkage in maltose is formed between _______________
Write the name of the polysaccharide used for the commercial preparation of glucose.
Write the name of the unit to which glucose unit is linked to from sucrose.
Explain the preparation of glucose from sucrose.
Write a chemical reaction to convert glucose into glucose cyanohydrin.
Draw the structure of the pyran.
Which enzymes would work sequentially on potatoes consumed by an individual?
Carbohydrates can contain which of the following chemical groups?
From the following which is a heteropolysaccharide?
______ is the prosthetic group of glycoproteins.
The reserve food material in animals is ____________.
Match the Column I and Column II select the correct option.
| Column I | Column II | ||
| i. | Monosaccharides | a. | Stored energy in animals |
| ii. | Glycogen | b. | Polymer made from ß-glucose molecules |
| iii. | Cellulose | c. | Exoskeleton of arthropods |
| iv. | Chitin | d. | Building blocks of carbohydrates |
| e. | Plant hormone |
Chitin is a/an ______.
Monosaccharides are ______ in nature.
Identify the CORRECT combination.
Match the columns and select the correct option.
| Column I | Column II | ||
| i. | Starch | a. | Animal storage molecule |
| ii. | Cellulose | b. | Plant storage molecule |
| iii. | Glycogen | c. | Heparin |
| iv. | Heteropolysaccharide | d. | Plant cell wall component |
Which carbon atoms of α- D glucopyranose and β-D-fructofuranose respectively are linked together to form glycosidic linkage in sucrose?
Raffinose, sucrose and stachyose are respectively ____________.
All these carbohydrates contain \[\ce{1 -> 4β}\] glycosidic linkage, EXCEPT ____________.
4-O-(α-D-Glucopyranosyl)-D-glucopyranose is ____________.
One mole of a carbohydrate on hydrolysis gives one mole of glucose and one mole of galactose. Identify the carbohydrate.
Which of the following monosaccharide is a ketohexose?
Which one of the following is an oligosaccharide?
Which of the following molecules reduces Fehling's solution?
How many moles of fructose and galactose respectively are obtained on hydrolysis of 1 mole stachyose?
What is the number of hydroxyl groups present in lactic acid?
Identify the number of secondary carbon atoms in glucose.
Which among the following is a product of hydrolysis of one mole raffinose?
When one mole of lactose is hydrolysed, the hydrolysate contains ____________.
Which one given below is a non-reducing sugar?
The number of sp2 and sp3 hybridised carbon in fructose are respectively ____________.
Glucose is an aldose. Which one of the following reactions is not expected with glucose?
α-D (+) Glucose and β-D (+) glucose are ____________.
Why carbohydrates are generally optically active?
Which of the following groups contain polysaccharides?
Identify the monosaccharide containing only one asymmetric carbon atom in its molecule.
Corn is immersed in boiling water. It is then cooled, and the solution becomes sweet. It is due to ______.
Formation of gluconic acid from glucose by oxidation using Br2 water.
Describe the action of the following reagent on glucose:
dil. Nitric acid.
Carbohydrates that do not undergo hydrolysis further are called ______.
Write Fischer projection formulae for glucose.
Write the ring structure of glucose.
CH2 OH - CO - (CHOH)4 - CH2 OH is an example of ______.
The linkage present in Lactose is ______.
Why carbohydrates are generally optically active?
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
Two monosaccharides are held together by ______ bond.
Given below are two statements.
Statement I - Lactose on hydrolysis converts into glucose and galactose.
Statement II - Galactose also plays same role as glucose in respiration.
In light of the above statements, select the correct option given below.
