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

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
by

1 Answer

Answer :

It is the acetal of a sugar.
by

Related questions

Which of the statements below correctly describes an achiral molecule? (a) The molecule has a nonsuperimposable mirror image. (b) The molecule exhibits optical activity when it interacts with plane-polarized light. (c) The molecule has an enantiomer. (d) The molecule might be a meso form

Description : Which of the statements below correctly describes an achiral molecule? (a) The molecule has a nonsuperimposable mirror image. (b) The molecule exhibits optical activity when it interacts with plane-polarized light. (c) The molecule has an enantiomer. (d) The molecule might be a meso form

Last Answer : The molecule might be a meso form

What are Hemiacetal and acetal ?

Description : What are Hemiacetal and acetal ? 

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

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

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

Last Answer : hemiacetal

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

Description : 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

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

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

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

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.

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.

What is Enantiomer ?

Description : What is Enantiomer ?

Last Answer : Light isotopes that rotate opposite the surface of a plane of light at the same angle of rotation and the rotation level of their homogeneous mixture is reduced to zero are called enantiomers of each other.

Which of the following is optically inactive? a. equimolar mixture of enantiomers b. Solution of pure enantiomer c. Mixture of enantiomers with enantiomeric excess of one isomer d. Molecule without symmetry elements

Description : Which of the following is optically inactive? a. equimolar mixture of enantiomers b. Solution of pure enantiomer c. Mixture of enantiomers with enantiomeric excess of one isomer d. Molecule without symmetry elements

Last Answer : a. equimolar mixture of enantiomers

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 (c) glucose is actually a cyclic aldehyde (d) its cyclic hemiacetal, the predominant form, is in equilibrium with the free aldehyde form

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

Pure (R) Mandelic acid has specific rotation of 150. If a sample contains 60% of the R and 40% of its enantiomer, the `[alpha]` of his solution is.

Description : Pure (R) Mandelic acid has specific rotation of 150. If a sample contains 60% of the R and 40% of its enantiomer, the `[alpha]` of his solution is.

Last Answer : Pure (R) Mandelic acid has specific rotation of 150. If a sample contains 60% of the R and 40% of its enantiomer, the `[alpha]` of his solution is.

Glucose on oxidation does not give (A) Glycoside (B) Glucosaccharic acid (C) Gluconic acid (D) Glucuronic acid

Description : Glucose on oxidation does not give (A) Glycoside (B) Glucosaccharic acid (C) Gluconic acid (D) Glucuronic acid

Last Answer : A

In a patient given a cardiac glycoside, important effects of the drug on the heart include which of the following? (a) Decreased atrioventricular conduction velocity (b) Decreased ejection time (c) Increased ectopic automaticity (d) Increased ectopic automaticity (e) All of the above

Description : In a patient given a cardiac glycoside, important effects of the drug on the heart include which of the following? (a) Decreased atrioventricular conduction velocity (b) Decreased ejection time (c) Increased ectopic automaticity (d) Increased ectopic automaticity (e) All of the above

Last Answer : Ans: E

Which of the following cardiovascular agents is classified chemically as a glycoside? (a) Nifedipine (b) Digoxin (c) Flecainide (d) Cholestyramine (e) Warfarin

Description : Which of the following cardiovascular agents is classified chemically as a glycoside? (a) Nifedipine (b) Digoxin (c) Flecainide (d) Cholestyramine (e) Warfarin

Last Answer : Ans: B

An example of N-glycoside is (A) Adenosine (B) Sinigrin (C) Rhein-8-glucoside (D) Aloin

Description : An example of N-glycoside is (A) Adenosine (B) Sinigrin (C) Rhein-8-glucoside (D) Aloin

Last Answer : (A) Adenosine

Among all cardiac glycosides, digoxin is the most commonly used, because: A. It is the most potent and fastest acting glycoside B. It has the highest and most consistent oral bioavailability C. It is the longest acting and the safest glycoside D. It has intermediate plasma half life so that dose adjustments are possible every 2-3 days and toxicity abates rather rapidly after discontinuatio

Description : Among all cardiac glycosides, digoxin is the most commonly used, because: A. It is the most potent and fastest acting glycoside B. It has the highest and most consistent oral ... so that dose adjustments are possible every 2-3 days and toxicity abates rather rapidly after discontinuatio

Last Answer : D. It has intermediate plasma half life so that dose adjustments are possible every 2-3 days and toxicity abates rather rapidly after discontinuatio

A molecule is said to be chiral (a) if it contains plane of symmetry (b) if it contains centre of symmetry (c) if it cannot be superimposed on its mirror image (d) if it can be superimposed on its mirror image

Description : A molecule is said to be chiral (a) if it contains plane of symmetry (b) if it contains centre of symmetry (c) if it cannot be superimposed on its mirror image (d) if it can be superimposed on its mirror image

Last Answer : if it cannot be superimposed on its mirror image

"Mirror-image" molecules are called: w) stereoisomers x) structural isomers y) diastereomers z) constitional isomers

Description : "Mirror-image" molecules are called: w) stereoisomers x) structural isomers y) diastereomers z) constitional isomers

Last Answer : ANSWER: W -- STEREOISOMERS

What is the name given to the non-superimposable mirror image forms of chiral compounds? w) cis-trans x) enantiomers y) functional isomers z) diasteriomers

Description : What is the name given to the non-superimposable mirror image forms of chiral compounds? w) cis-trans x) enantiomers y) functional isomers z) diasteriomers

Last Answer : ANSWER: X -- ENANTIOMERS

. A and B are stereoisomers. They are nonsuperimposable and are mirror images of one another. Which of the following best describes the relationship between A and B? (a) structural isomers (b) enantiomers (c) cis-trans isomers (d) diastereomers

Description : . A and B are stereoisomers. They are nonsuperimposable and are mirror images of one another. Which of the following best describes the relationship between A and B? (a) structural isomers (b) enantiomers (c) cis-trans isomers (d) diastereomers

Last Answer : enantiomers

Which of the statements is correct about diastereomers? (a) They are stereoisomers that are not enantiomers. (b) They are a pair of identical isomers. (c) They are a pair of isomers that are mirror images. (d) All their asymmetric centers are the same.

Description : Which of the statements is correct about diastereomers? (a) They are stereoisomers that are not enantiomers. (b) They are a pair of identical isomers. (c) They are a pair of isomers that are mirror images. (d) All their asymmetric centers are the same.

Last Answer : They are stereoisomers that are not enantiomers

Which of the following statements is false about enantiomers? (a) rotate plane-polarized light (b) are superimposable mirror images (c) are nonsuperimposable mirror images (d) have the same melting point

Description : Which of the following statements is false about enantiomers? (a) rotate plane-polarized light (b) are superimposable mirror images (c) are nonsuperimposable mirror images (d) have the same melting point

Last Answer : are superimposable mirror images

Does your face look strange to you when you see an actual image of yourself as opposed to your reverse mirror image?

Description : Does your face look strange to you when you see an actual image of yourself as opposed to your reverse mirror image?

Last Answer : answer:Mostly no. But I do have a bit of a hump in my nose. I try to make it look less obvious in photographs. You’d only really notice it if I took a side profile picture. Don’t beat yourself up over it.

Is what we see in the mirror a 3D image or a 2D image?

Description : Is what we see in the mirror a 3D image or a 2D image?

Last Answer : answer:well, like a steriopticon, if you close one eye when you look in the mirror you see one thing, and if you close the other, you see something else. Seems pretty 3D to me. I have been ... room with only one light source, say a window, reflects that window, does the light increase in the room?

When you look in the mirror, is the reflection similar to the image you have of yourself?

Description : When you look in the mirror, is the reflection similar to the image you have of yourself?

Last Answer : answer:Very different. In my mind I’m thinner and younger. When I see a current pic of myself, I wonder who the old man is.

What would the mirror image of your life look like?

Description : What would the mirror image of your life look like?

Last Answer : I’d be poor, miserable, homeless and without children. Smarter, and much better looking.

I recently bought a TV that allows me to rotate the picture so it is upside down, mirror image or upside down mirror image. Huh? Do you know why a person would need or want to this feature on a television set?

Description : I recently bought a TV that allows me to rotate the picture so it is upside down, mirror image or upside down mirror image. Huh? Do you know why a person would need or want to this feature on a television set?

Last Answer : Someone who watches TV through a mirror a lot?

In a CAD package, mirror image of a 2D point P (5, 10) is to be obtained about a line whichpasses through the origin and makes an angle of 45° counterclockwise with the X-axis. The coordinates of the transformed point will be a.(7.5, 5) b.(10, 5) c.(7.5, -5) d.(10, -5)

Description : In a CAD package, mirror image of a 2D point P (5, 10) is to be obtained about a line whichpasses through the origin and makes an angle of 45° counterclockwise with the X-axis. The coordinates of the transformed point will be a.(7.5, 5) b.(10, 5) c.(7.5, -5) d.(10, -5)

Last Answer : b.(10, 5)

Which of the following is NOT true?Image formed by reflection through a plane mirror is a.of same size b.same orientation c.is at same distance from the mirror d.virtual

Description : Which of the following is NOT true?Image formed by reflection through a plane mirror is a.of same size b.same orientation c.is at same distance from the mirror d.virtual

Last Answer : b.same orientation

A boy leaves home in the morning to go to school. At the moment he leaves the house he looks at the clock in the mirror. The clock has no number indication and for this reason the boy makes a mistake in interpreting the time (mirror-image). Just assuming the clock must be out of order, the boy cycles to school, where he arrives after twenty minutes. At that moment the clock at school shows a time that is two and a half hours later than the time that the boy saw on the clock at home. -Riddles

Description : A boy leaves home in the morning to go to school. At the moment he leaves the house he looks at the clock in the mirror. The clock has no number indication and for this reason the boy makes a mistake in ... is two and a half hours later than the time that the boy saw on the clock at home. -Riddles

Last Answer : The difference between the real time and the time of the mirror image is two hours and ten minutes (two and a half hours, minus the twenty minutes of cycling). Therefore, the original time on ... at five minutes past seven plus twenty minutes of cycling, which is twenty-five minutes past seven!...

14. An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? What will be the nature and the size of the -Chemistry-10

Description : 14. An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? What will be the nature and the size of the -Chemistry-10

Last Answer : Answer. hope this helps you

15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained? Find the size and nature of the image. -Physics-10

Description : 15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained? Find the size and nature of the image. -Physics-10

Last Answer : Object distance (u) = – 27 cm Object height (h) = 7 cm Focal length (f) = – 18 cm According to the mirror formula, The negative value of image height indicates that the image formed is inverted.

14. An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image. -Physics-10

Description : 14. An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image. -Physics-10

Last Answer : Object distance (u) = - 20 cm Object height (h) = 5 cm Radius of curvature (R) = 30 cm Radius of curvature = 2 Focal length R = 2f f = 15 cm According to the mirror formula, ... image height indicates that the image formed is erect. Hence, the image formed is erect, virtual, and smaller in size.

12. An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image. -Physics-10

Description : 12. An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image. -Physics-10

Last Answer : Focal length of convex mirror (f) = +15 cm Object distance (u) = - 10 cm According to the mirror formula, The image is located at a distance of 6 cm from the mirror on the other ... and a value of less than 1 of magnification indicates that the image formed is virtual and erect and diminished.

We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? -Physics-10

Description : We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? -Physics-10

Last Answer : Range of the distance of the object = 0 to 15 cm from the pole of the mirror. Nature of the image = virtual, erect, and larger than the object.

5. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be -Physics-10

Description : 5. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be -Physics-10

Last Answer : (d) The mirrors are likely to be either plane or convex

2. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object? -Physics-10

Description : 2. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object? -Physics-10

Last Answer : (d) The position of the object should be between the pole of the mirror and its principal focus.

2. A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located? -Physics-10

Description : 2. A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located? -Physics-10

Last Answer : Magnification produced by a spherical mirror: Object distance (u) = – 10 cm v = 3 × (- 10) = – 30 cm Therefore, the negative sign indicates that an inverted image is formed in front of the given concave mirror at a distance of 30 cm.

3. Name the mirror that can give an erect and enlarged image of an object. -Physics-10

Description : 3. Name the mirror that can give an erect and enlarged image of an object. -Physics-10

Last Answer : The mirror that can give an erect and enlarged image of an object is Concave Mirror.

Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: (i) at the centre of curvature of a concave mirror (ii) between the pole P and focus F of a concave mirror (iii) in front of a convex mirror (iv) at 2F of a convex lens (v) in front of a concave lens -Physics

Description : Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: (i) at the centre of curvature of a concave mirror (ii) between the pole P and focus F of ... front of a convex mirror (iv) at 2F of a convex lens (v) in front of a concave lens -Physics

Last Answer : Answer. Nature of image: Real, inverted and same size image is formed at the centre of curvature. Nature of image: Virtual, enlarged and erect image is formed behind the mirror. Nature of image: Virtual ... : Virtual, erect and diminished image is formed between O and F on the same side of object.

An object is placed at a distance of 12 cm in front of a concave mirror of radius of curvature 30 cm. List four characteristics of the image formed by the mirror. -Science

Description : An object is placed at a distance of 12 cm in front of a concave mirror of radius of curvature 30 cm. List four characteristics of the image formed by the mirror. -Science

Last Answer : Here, radius of curvature of concave mirror, R = 30 cm. Therefore, focal length of the mirror, f = R/2 = 30/2 = 15 cm Also, object distance, u = 12 cm Hence, knowing the focal length of mirror and ... (i) Erect (ii) Larger in size than that of the object (iii) Virtual and (iv) Behind the mirror.

A concave mirror of focal length 15 cm can form a magnified, erect as well as inverted image of an object placed in front of it." Justify this statement stating the position of the object with respect to the pole of the mirror in both the cases for obtaining the images. -Science

Description : A concave mirror of focal length 15 cm can form a magnified, erect as well as inverted image of an object placed in front of it." Justify this statement stating the position of the object with respect to the pole of the mirror in both the cases for obtaining the images. -Science

Last Answer : For magnified and erect image the object is placed between pole P and focus F. For magnified and inverted image the object is placed either at focus or anywhere between F and C.

How many image will be formed if two mirrors are fitted adjacent walls and one mirror on ceiling? -Do You Know?

Description : How many image will be formed if two mirrors are fitted adjacent walls and one mirror on ceiling? -Do You Know?

Last Answer : answer:

Which are the Continents that form a mirror image of each other? -Do You Know?

Description : Which are the Continents that form a mirror image of each other? -Do You Know?

Last Answer : answer:

does a plane mirror produces a real image?

Description : does a plane mirror produces a real image?

Last Answer : Real and "virtual" are two opposite, mutually exclusivecategories of images.An image is either one or the other, and no image can beboth.The image produced by a plane mirror is a virtual one.

What will be the image if it is a mirror ?

Description : What will be the image if it is a mirror ?

Last Answer : If the wool is mirrored, the image will be unreal , straight and short.

Where is the image formed in the plane mirror ?

Description : Where is the image formed in the plane mirror ?

Last Answer : The image is formed behind a plane mirror.

The image distance in case of a convex mirror can be

Description : The image distance in case of a convex mirror can be

Last Answer : The image distance in case of a convex mirror can be A. greater than focal length B. less than focal length ... to focal length D. Both (b) and (c)

The size of an image formed by a plane mirror is _____.

Description : The size of an image formed by a plane mirror is _____.

Last Answer : The size of an image formed by a plane mirror is _____. A. larger than the size of the object. ... the size of the object. D. Cannot be determined.

Image formed by a convex mirror is _____

Description : Image formed by a convex mirror is _____

Last Answer : Image formed by a convex mirror is _____ A. virtual B. erect C. smaller in size than the object D. All the above.

Real image is formed by a ______ mirror.

Description : Real image is formed by a ______ mirror.

Last Answer : Real image is formed by a ______ mirror.