In solution, glucose exists as _________
(a) the open-chain form only
(b) the cyclic hemiacetal form only
(c) the cyclic acetal form only
(d) an equilibrium mixture of the open-chain form and cyclic hemiacetal forms

1 Answer

Answer :

an equilibrium mixture of the open-chain form and cyclic hemiacetal forms

Related questions

Description : An aqueous solution of glucose behaves as an aldehyde because __________. (a) it is hydrolyzed by water to the free aldehyde (b) it is a ketone, but is in equilibrium with the aldehyde form ... aldehyde (d) its cyclic hemiacetal, the predominant form, is in equilibrium with the free aldehyde form

Last Answer : its cyclic hemiacetal, the predominant form, is in equilibrium with the free aldehyde form

Description : What are Hemiacetal and acetal ? 

Last Answer : Ans. Hemiacetal and acetals are formed by addition of alcohols on carboxyl compounds.  

Description : α-D-Glucopyranose is a(n) : (a) hemiacetal (b) hemiketal (c) acetal (d) keta

Last Answer : hemiacetal

Description : Which of the following statements best describes the meaning of a “glycoside”? (a) It is the mirror image of a sugar. (b) It is the hemiacetal of a sugar. (c) It is the acetal of a sugar. (d) It is the enantiomer of a sugar

Last Answer : It is the acetal of a sugar.

Description : The reaction of ethanal with one equivalent of methanol and a trace of an acid will give (a) Acetal (b) Hemiacetal (c) Ketal (d) Hemiketa

Last Answer : Hemiacetal

Description : Which of the following statements is false about α-D-glucose? (a) it has a pyranose ring. (b) it is a hemiacetal. (c) it shows mutarotation. (d) it is the purest form of table sugar.

Last Answer : it is the purest form of table sugar.

Description : How Geometric Equilibrium is Created in Cyclic Compounds ?

Last Answer : : Geometric similarity is seen in the cyclic compound. In the case of cyclic compounds, in the three-dimensional structure of a molecule, identical atoms or radicals are formed on one side, sis ... isosomes are formed. For example , two geometric isotopes of 1-2-dimethyl cyclopropane are possible.

Description : For a cyclic process, a fixed ratio between heat and work (A) Always exists (B) May exist (C) Never exists (D) Is difficult to predict

Last Answer : (A) Always exists

Description : Enumerate two reactions of glucose which cannot be explained by its open chain structure.

Last Answer : Ans. (i) Glucose does not give Schiff‘s Test although it contains aldehyde group. (ii) Glucose does not form crystaline product with NaHSO3 .

Description : Wax used for making candle is chemically a mixture of – (1) aliphatic hydrocarbons (2) aromatic hydrocarbons (3) cyclic hydrocarbons (4) aliphatic and aromatic hydrocarbons

Last Answer : (1) aliphatic hydrocarbons Explanation: An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings ... naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains.

Description : Wax used for making candle is chemically a mixture of (1) aliphatic hydrocarbons (2) aromatic hydrocarbons (3) cyclic hydrocarbons (4) aliphatic and aromatic hydrocarbons 

Last Answer :  aliphatic hydrocarbons

Description : Out of glucose, urea and dodecyl trimethyl ammonium chloride, which one forms micelles in aqueous solution above certain concentration ?

Last Answer : Ans. Dodecyl trimethyl ammonium chloride. 

Description : A mixture of benzene and toluene forms (1) Non-ideal solution (2) Ideal solution (3) Emulsion (4) Suspension

Last Answer : (2) Ideal solution Explanation: A mixture of benzene and toluene (60 mole% toluene) enters a distillation column to be separated into two product streams.

Description : An open form can not be execute the call_form procedure if you chain of called forms has been initiated by another open form?

Last Answer : True

Description : What is the name given to an element that exists in two or more physical forms?

Last Answer : ANSWER: ALLOTROPIC 

Description : Action of glycogen synthase is inhibited by (A) Insulin (B) Glucose (C) Mg2+ (D) Cyclic AMP

Last Answer : Answer : C

Description : Glycogen synthetase activity is depressed by (A) Glucose (B) Insulin (C) Cyclic AMP (D) Fructokinase

Last Answer : C

Description : The divisor in a cyclic code is normally called the _________. A) degree B) generator C) redundancy D) none of the above

Last Answer : generator

Description : Assertion :- A gas mixed with another gas forms a colloidal solution. Reason :- Mixture of gases is homogenous system.

Last Answer : Assertion :- A gas mixed with another gas forms a colloidal solution. Reason :- Mixture of gases is ... . D. If both Assertion & Reason are False.

Description : n simple Keynesian model, stability of equilibrium exists, if (a) APC is less than one. (b) APS is less than one. © MPC is less than one. (d) None of the above.

Last Answer : (a) APC is less than one.

Description : P and Q are isomer of dicraboxylic acid `C_(4)H_(4)O_(4)` Both decolourixe `Br_(2)//H_(2)O`. On heating , P forms the cyclic anhydride. Upon treatment

Last Answer : P and Q are isomer of dicraboxylic acid `C_(4)H_(4)O_(4)` Both decolourixe `Br_(2)//H_(2)O`. On ... sequences V and W are respectively A. B. C. D.

Description : `P` and `Q` are isomers of dicarboxylic acid `C_(4)H_(4)O_(4)`. Bothdecolorize `Br_(2)//H_(2)O`. On heating, `P` forms the cyclic anhydride. Upon trea

Last Answer : `P` and `Q` are isomers of dicarboxylic acid `C_(4)H_(4)O_(4)`. Bothdecolorize `Br_(2)// ... . Optically inactive pair (T, U) and optically inactive S

Description : The only matter which exists in three forms (Solid; liquid; gas)?

Last Answer : Water

Description : If a piece of metal at -20 degrees Celsius is added to an ice and water mixture in equilibrium at 0 degrees Celsius, the amount of ice will: w) Increase x) Remain the same y) Decrease

Last Answer : ANSWER: W -- INCREASE

Description : Which of the following statements best describes the meaning of mutarotation ? (a) a rapid exchange between the α and β forms of diastereomeric sugars (b) a rapid exchange between the D ... between hydrogen and deuterated hydrogen (d) a slow change in optical rotation to reach an equilibrium value

Last Answer : a slow change in optical rotation to reach an equilibrium value

Description : Which of following compounds exists as non-resolvable racemic mixture?

Last Answer : Which of following compounds exists as non-resolvable racemic mixture? A. B. C. D.

Description : (4) A mixture of Fe₂O₃, 3H₂O and FeO Explanation: Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances. Rust consists of hydrated iron (III) oxides Fe2O

Last Answer : Catalyst is a substance which – (1) increases the rate of the reaction (2) decreases the rate of reaction (3) has no action on the rate of the reaction (4) None of these

Description : Which of the following statements best describes the difference between amylose and amylopectin? (a) Amylose is a branched polysaccharide while amylopectin is a chain polysaccharide. (b) Amylose is a ... of thousands of D-glucose units while amylopectin is composed of thousands of D-galactose units.

Last Answer : Amylose is a straight-chain polysaccharide while amylopectin is a branched polysaccharide

Description : Assertion (A) Both rhombic and monoclinic sulphur exist as `S_(8)` but oxygen exists as `O_(2)`. Reason (R ) Oxygen forms `ppi-ppi` multiple bond due

Last Answer : Assertion (A) Both rhombic and monoclinic sulphur exist as `S_(8)` but oxygen exists as `O_ ... Statement-I is not correct and Statement-II is correct

Description : Insulin exists in polymeric forms, for polymerization it requires (A) Calcium (B) Magnesium (C) Manganese (D) Zinc

Last Answer : Answer : D

Description : What is allotrope ? In what forms of cubic pattern, iron exists ?

Last Answer : Some elements exist in more than one crystalline form. Each form is known as “allotrope”. Iron exists in two forms of cubic pattern, namely body centered cubic (bcc) and face-centered cubic (fee).

Description : What is allotrope ? In what forms of cubic pattern, iron exists ?

Last Answer : Some elements exist in more than one crystalline form. Each form is known as “allotrope”. Iron exists in two forms of cubic pattern, namely body centered cubic (bcc) and face-centered cubic (fee).

Description : The phenomenon by which the same element exists in the same physical state in different forms is known as?

Last Answer : Allotropy

Description : Pick out the wrong statement. (A) Tin can be readily and very easily drawn into very fine wire (B) Tin can be severely cold worked without the necessity of annealing due to its low recrystallisation temperature (C) Tin exists in two allotropic forms

Last Answer : (A) Tin can be readily and very easily drawn into very fine wire

Description : Titanium metal (A) Exists in three allotropic forms (B) Cannot be welded (C) Is used in oceanographic and space exploration applications (D) None of these

Last Answer : (C) Is used in oceanographic and space exploration applications

Description : What Is Allot Rope? In What Forms Of Cubic Pattern, Iron Exists?

Last Answer : Some elements exist in more than one crystalline form. Each crystalline form is known as ‘allotrope’ of the element. Iron exists in two crystalline forms of cubic pattern, namely, bodycentered cubic (BCC) and face-centered cubic (FCC).

Description : When glycerol is treated with a mixture of concentrated HNO3 + H2SO4, it forms (a) Nitroethane (b) 1-Nitropropane (c) Nitroglycerine (d) 2-Nitropropane

Last Answer : Nitroglycerine

Description : Consider the following gas - phase reaction : `2A(g)+B(g)rArrC(g)+D(g)` An equilibrium mixture of reactants and products is subjected to the following

Last Answer : Consider the following gas - phase reaction : `2A(g)+B(g)rArrC(g)+D(g)` An equilibrium mixture of reactants and ... II, III C. II, III, IV D. I, III

Description : A standard ice point temperature corresponds to the temperature of (a) water at 0°C (b) ice at - 4°C (c) mixture of ice, water and vapour under equilibrium conditions under NTP conditions (d) mixture of ice and water Under equilibrium conditions.

Last Answer : Ans: D

Description : The equilibrium liquid composition compared to the vapor composition in case of Azeotropic mixture is (A) More (B) Less (C) Same (D) Either more or less; depends on the system

Last Answer : (C) Same

Description : In Azeotropic mixture, the equilibrium vapour composition is (A) More than liquid composition (B) Less than liquid composition (C) Same as liquid composition (D) Independent of pressure

Last Answer : (C) Same as liquid composition

Description : The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of ... A) Liquid side (B) Gas side (C) Interfacial (D) Both liquid and gas side

Last Answer : (B) Gas side

Description : For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant (A) Is independent of pressure (B) Increases with pressure (C) Decreases with pressure (D) Increases /decreases with pressure depending on the stoichiometric co￾efficients of the reaction

Last Answer : (B) Increases with pressure

Description : What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor? (A) 2 (B) 0 (C) 3 (D) 1

Last Answer : (A) 2

Description : Pick out the wrong statement. (A) Minimum number of degree of freedom of a system is zero (B) Degree of freedom of a system containing a gaseous mixture of helium, carbon ... ) Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

Last Answer : (D) Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

Description : The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is (A) 3 (B) 1 (C) 2 (D) 0

Last Answer : B) 1

Description : _________ explains the equilibrium constant for any chemical reaction. (A) Henry's law (B) Law of mass action (C) Hess's law (D) None of these

Last Answer : (B) Law of mass action

Description : Which of the following statements is false about cyclohexane? (a) It is a saturated cyclic hydrocarbon (b) All C–C–C bond angles are 109°28' (c) It is very unstable, strained compound. (d) It can exist in two conformations which are designated as the boat-form and the chair-form

Last Answer : It is very unstable, strained compound

Description : A single covalent bond (a) Is formed by the transfer of two electrons (b) Exists between hydrogen and chlorine in an aqueous solution, of hydrochloric acid (c) Is longer than a double bond (d) Does not require energy to disrupt it unlike an ionic bond

Last Answer : Ans:(c)

Description : An algorithm A is admissible if ___________ a) It is not guaranteed to return an optimal solution when one exists b) It is guaranteed to return an optimal solution when one exists c) It returns more solutions, but not an optimal one d) It guarantees to return more optimal solutions

Last Answer : b) It is guaranteed to return an optimal solution when one exists