Multiple Choice Quiz

Multiple Choice Quiz

Multiple Choice Quiz


1		Which descriptors fit the following sugar best?
			A)	ketose, furanose, α
			B)	ketose, furanose, β
			C)	aldose, pyranose, β
			D)	aldose, pyranose, α


2		Which of the following is the correct Fischer representation of D-galactose? Hint: The structure of β-D-galactopyranose is provided.
			A)
			B)
			C)
			D)


3		Which of the following structures is the correct Haworth representation of D-idose?
			A)
			B)
			C)
			D)


4		Which of the following is the correct Fischer representation of (3R,4S,5S)-ketohexose?
			A)
			B)
			C)
			D)


5		Which Fischer structure represents the open form of the following two anomers?
			A)
			B)
			C)
			D)


6		Which of the following compounds does NOT undergo mutarotation?
			A)	glucose
			B)	sucrose
			C)	ribose
			D)	fructose


7		D-Mannose is epimeric with D-glucose at C₂. Which of the following structures represents β-D-mannopyranose?
			A)	a
			B)	b
			C)	c
			D)	d


8		Galactose is epimeric with glucose at C₄. Which of the following structures represents β-D-galactopyranose?
			A)	a
			B)	b
			C)	c
			D)	d


9		A glycoside is shown below. What is the structure of the carbohydrate from which it was formed?
			A)
			B)
			C)
			D)


10		A glycoside is the carbohydrate form of an
			A)	ether.
			B)	acetal.
			C)	aglycone.
			D)	alcohol.


11		Which structure corresponds to methyl β-D-galactopyranoside, which is formed by the reaction of D-galactose with HCl in methanol?
			A)
			B)
			C)
			D)


12		Which structure represents the β form of the glycoside formed from n-butanol and D-glucose?
			A)	a
			B)	b
			C)	c
			D)	d


13		Which of the following structures is NOT going to give a positive test with Benedict’s reagent?
			A)
			B)
			C)
			D)


14		What is the D-monosaccharide (open or ring form) used in the following reaction?
			A)
			B)
			C)
			D)


15		Predict the product of the following reaction.
			A)
			B)
			C)
			D)


16		Predict the product of the following reaction.
			A)
			B)
			C)
			D)


17		How many aldaric acids are obtained upon nitric acid oxidation of the D- and L-aldopentoses?
			A)	2
			B)	4
			C)	6
			D)	8


18		When a carbohydrate reacts with NaBH₄, the product is an
			A)	alditol.
			B)	aldaric acid.
			C)	aldonic acid.
			D)	aglycone.


19		Reduction of hexose A (molecular formula C₆H₁₂O₆) with sodium borohydride gives compounds B and C. Compound B is optically inactive, whereas compound C is optically active. Which of the following is compound A?
			A)	D-fructose
			B)	D-glucose
			C)	D-mannose
			D)	D-galactose


20		Which product will be formed in the following reaction?
			A)	a
			B)	b
			C)	c
			D)	d


21		Which of the following carbohydrates cannot be used to make an aldohexose by the Kiliani–Fischer synthesis?
			A)
			B)
			C)
			D)


22		In the Kiliani–Fischer synthesis, the anomeric carbon of the starting carbohydrate
			A)	remains as the carbonyl.
			B)	is lost as CO₂.
			C)	becomes the new epimeric stereocenter.
			D)	becomes a nitrile carbon.


23		In the Kiliani–Fischer synthesis starting from D-ribose, which pair of stereoisomers would be formed?
			A)	a and b
			B)	b and e
			C)	c and d
			D)	d and e


24		In the following scheme, which of the following monosaccharides will give the same product as D-glucose?
			A)
			B)
			C)
			D)


25		Which of the following structures is a D-aldotetrose that gives a meso diacid upon oxidation with dilute aq. HNO₃?
			A)	a
			B)	b
			C)	c
			D)	d


26		Which of the following aldoses gives an optically active compound upon reaction with warm, dilute nitric acid?
			A)	a
			B)	b
			C)	c
			D)	d


27		Which of the following disaccharides fulfills the two requirements stated below? 1. α-(1,2) glycosidic linkage 2. Not a reducing sugar
			A)
			B)
			C)
			D)


28		What is the product of the following reaction?
			A)
			B)
			C)
			D)


29		Which statements are correct about the following disaccharide?
			A)	Ring A is an acetal in the α configuration; ring B is a hemiacetal in the β configuration.
			B)	Ring A is an acetal in the β configuration; ring B is a hemiacetal in the α configuration.
			C)	Ring A is a hemiacetal in the α configuration; ring B is an acetal in the β configuration.
			D)	Ring A is a hemiacetal in the β configuration; ring B is an acetal in the α configuration.


30		How many aldose and ketose, and furanose and pyranose units are present in maltose?
			A)	0 aldose, 2 ketose, 0 furanose, 2 pyranose
			B)	1 aldose, 1 ketose, 1 furanose, 1 pyranose
			C)	2 aldose, 0 ketose, 0 furanose, 2 pyranose
			D)	2 aldose, 0 ketose, 1 furanose, 2 pyranose

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