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Chemistry Expert Q&A

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TL

Tatyana Little

1 day ago

When D-(+) -xylose is treated with nitric acid, which of the following results?

A) a racemic mixture of aldaric acids
B) an optically active aldaric acid
C) an optically inactive aldaric acid
D) an optically active aldonic acid
E) an optically inactive aldonic acid

CA

Chailey Alana

1 day ago

Sucrose is hydrolyzed to what two monosaccharides?

A) glucose and fructose
B) glucose and galactose
C) maltose and fructose
D) galactose and lactose
E) galactose and maltose

SB

Sanish Byanjankar

1 day ago

An aglycone is a group bound to ________.

A) the oxygen of C6 in a glycoside
B) the anomeric carbon in a glycoside
C) a pyrimidine base
D) a purine base
E) a xanthate

MO

Marwan Obeidat

1 day ago

When D-(+) -allose is treated with bromine water, which of the following results?

A) a racemic mixture of aldaric acids
B) an optically active aldaric acid
C) an optically inactive aldaric acid
D) an optically active aldonic acid
E) an optically inactive aldonic acid

LM

LEANDRO MARTINEZ

1 day ago

When L-(+) -lyxose is treated with nitric acid, which of the following results?

A) a racemic mixture of aldaric acids
B) an optically active aldaric acid
C) an optically inactive aldaric acid
D) an optically active aldonic acid
E) an optically inactive aldonic acid

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CW

Courtney Weisenberger

1 day ago

When L-erythrose is treated with NaBH₄, ________.

A) a 70:30 mixture of enantiomeric alditols results
B) a 50:50 mixture of enantiomeric alditols results
C) a meso alditol is produced
D) the product mixture contains two diastereomeric alditols
E) an optically active alditol is produced

LG

Layla Guest

1 day ago

Reduction of a 2-ketohexose with NaBH₄ yields ________.

A) a single aldohexose
B) a mixture of acetals
C) a mixture of alditols
D) a mixture of cyclic hemiacetals
E) a single pyranose

CH

Corey Hurles

1 day ago

Which of the following statements is true?

A) All monosaccharides in either the ketose of aldose family are reducing sugars.
B) Only aldoses, but not ketoses, are reducing sugars.
C) Only ketoses, but not aldoses, are reducing sugars.
D) All disaccharides, not monosaccharides, are reducing sugars.
E) All glycosides are reducing sugars.

AY

Allison Yoder

1 day ago

What is the outcome of the following reaction?

What is the outcome of the following reaction? A) No Reaction B) C) D)

A) No Reaction
B)

What is the outcome of the following reaction? A) No Reaction B) C) D)

What is the outcome of the following reaction? A) No Reaction B) C) D)

What is the outcome of the following reaction? A) No Reaction B) C) D)

NK

Nolan Kellough

1 day ago

What are the two most common unwanted side reactions which can occur when monosaccharides are treated with base?

A) epimerization and enediol rearrangement
B) mutarotation and epimerization
C) enediol rearrangement and glycoside formation
D) Kiliani-Fischer and Ruff degradations
E) Ruff degradation and glycoside formation

CM

Christy Mccandless

1 day ago

Anomers of D-glucopyranose differ in their stereochemistry at ________.

A) C5
B) C4
C) C3
D) C2
E) C1

EB

emily barea

1 day ago

When a monosaccharide reacts to give the pyranose form from its open-chain form, how many distinct pyranose forms are possible?

A) 1
B) 2
C) 2ⁿ, where n is the number of carbons present
D) 4n + 2, where n is the number of carbons present
E) 4

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AH

Ashley Hanley

1 day ago

Six-membered cyclic hemiacetals and five-membered cyclic hemiacetals are called, respectively, ________.

A) mannoses and xyloses
B) maltoses and arabinoses
C) pyranoses and furanoses
D) glyoses and fructoses
E) none of the above

YP

Yasaira Parada

1 day ago

How many asymmetric carbons are present in α-D-ribopyranose?

A) 0
B) 1
C) 2
D) 3
E) 4

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MP

Madeleine Pellerin

1 day ago

In solution, glucose exists as ________.

A) the open-chain form only
B) the cyclic hemiacetal form only
C) an equilibrium mixture of the open-chain form and cyclic acetal forms
D) an equilibrium mixture of the open-chain form and cyclic hemiacetal forms

AS

ANKIT SINGH

1 day ago

Stereoisomeric aldohexoses that differ in configuration at only a single carbon are ________.

A) meso compounds
B) threo sugars
C) enantiomers
D) constitutional isomers
E) epimers

CD

CHINAAA DA DOLL

1 day ago

In a Haworth projection of a five-membered cyclic hemiacetal, ________.

A) the C6 carbon is drawn on the right
B) the C2 carbon is drawn on the left
C) the ring oxygen is drawn in the front
D) the ring oxygen is drawn in the back
E) all hydroxyls are always on the same side of the molecule

JB

Julia Budge

1 day ago

Identify the C₃ epimer of the sugar below drawn in its open chain (acyclic) Fischer projection.

Identify the C<sub>3</sub> epimer of the sugar below drawn in its open chain (acyclic) Fischer projection. A) B) C) D)

Identify the C<sub>3</sub> epimer of the sugar below drawn in its open chain (acyclic) Fischer projection. A) B) C) D)

Identify the C<sub>3</sub> epimer of the sugar below drawn in its open chain (acyclic) Fischer projection. A) B) C) D)

Identify the C<sub>3</sub> epimer of the sugar below drawn in its open chain (acyclic) Fischer projection. A) B) C) D)

Identify the C<sub>3</sub> epimer of the sugar below drawn in its open chain (acyclic) Fischer projection. A) B) C) D)

GP

Genesis Palma

1 day ago

Which of the following correctly describes the structural relationship between D-gulose and L-gulose?

A) diastereomers and epimers
B) diastereomers but not epimers
C) enantiomers
D) constitutional isomers
E) not isomers

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CT

Catty Thobakgale

1 day ago

Which of the following descriptions apply to both dihydroxyacetone and D-fructofuranose?
I. They are both ketoses.
II. They are both aldoses.
III. They are enatiomers of each other.
IV. They are diastereomers of each other.
V. They are epimers of each other.

A) I
B) II
C) I and III
D) II and IV
E) II, IV and V

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