Multiple Choice Quiz

Multiple Choice Quiz

Multiple Choice Quiz


1		What is the relationship between 1-butene and cis-2-butene?
			A)	unrelated compounds
			B)	constitutional isomers
			C)	enantiomers
			D)	diastereomers


2		What is the relationship between trans-2-butene and cis-2-butene?
			A)	unrelated compounds
			B)	constitutional isomers
			C)	enantiomers
			D)	diastereomers


3		Determine the relationship between the two molecules shown.
			A)	constitutional isomers
			B)	enantiomers
			C)	diastereomers
			D)	identical molecules


4		Determine the relationship between the two molecules shown.
			A)	constitutional isomers
			B)	enantiomers
			C)	diastereomers
			D)	identical molecules


5		Give all terms that describe compounds (a) and (b).
			A)	enantiomers
			B)	diastereomers
			C)	same compound
			D)	chiral molecules


6		How many stereoisomers are there for the following structure?
			A)	1
			B)	2
			C)	3
			D)	4


7		Which of the following molecules exists as a pair of enantiomers?
			A)	2-Bromopropane
			B)	1-Bromo-3-methylbutane
			C)	2-Cyclohexen-1-ol
			D)	cis-1,2-Dichlorocyclobutane


8		Which of the following diols exists as a pair of enantiomers?
			A)	cis-1,3-Cyclohexanediol
			B)	trans-1.3-Cyclohexanediol
			C)	cis-1,4-Cyclohexanediol
			D)	trans-1,4-Cyclohexanediol


9		Which of the following is capable of existing as a pair of enantiomers?
			A)	2-methylpropane
			B)	2-methylpentane
			C)	3-methylpentane
			D)	3-methylhexane


10		Which of the 7 isomers of dichlorocyclohexane possess a plane of symmetry?
			A)	cis-1,2; cis-1,3;
			B)	1,1; cis-1,2; cis-1,3;
			C)	cis-1,2; cis-1,3; cis-1,4;
			D)	1,1; cis-1,2; cis-1,3; cis-1,4; trans-1,4


11		Which of the following has a plane of symmetry?
			A)	cis-1,2-Dimethylcyclohexane
			B)	trans-1,3-Dimethylcyclohexane
			C)	1,3-Dimethylcyclohexene
			D)	1,4-Dimethylcyclohexene


12		What is the IUPAC name of the following molecule?
			A)	(3R,5S)-dibromohexane
			B)	(2R,4R)-dibromohexane
			C)	(2R,4S)-dibromohexane
			D)	(R,S)-dibromohexane


13		Which of the following groups has the highest priority in the (R,S) system?
			A)
			B)	–CH=CH₂
			C)	–CH₂–CH₃
			D)


14		What is the correct name for this molecule?
			A)	(2R,3R)-2-bromo-3-chlorobutane
			B)	(2S,3R)-2-bromo-3-chlorobutane
			C)	(2S,3S)-2-bromo-3-chlorobutane
			D)	(2R,3S)-2-bromo-3-chlorobutane


15		The respective configurations of a and b are:
			A)	(2R,3S) and (2R,3R)
			B)	(2S,3R) and (2S,3R)
			C)	(2S,3S) and (2R,3R)
			D)	(2S,3R) and (2S,3S)


16		What is the specific rotation 20[α ]_D of the following molecule?
			A)	+4.42^o
			B)	+0.442^o
			C)	+44.2^o
			D)	– 44.2^o


17		Which of the following physical properties differ for each of a pair of enantiomers?
			A)	solubility in ethanol
			B)	direction of rotation of plane-polarized light
			C)	boiling point and melting point
			D)	index of refraction


18		An optically active compound is composed of 75% of the (R) enantiomer and 25% of the (S) enantiomer. The enantiomeric excess (ee) is equal to
			A)	87.5%.
			B)	75%.
			C)	50%.
			D)	37.5%.


19		If a sample of 2-butanol has an enantiomeric excess of 60% of l-2-butanol, how much of each isomer is present?
			A)	60% levorotatory and 40% dextrorotatory
			B)	80% levorotatory and 20% dextrorotatory
			C)	70% levorotatory and 30% dextrorotatory
			D)	66% levorotatory and 34% dextrorotatory


20		How many stereocenters are there in the following molecule?
			A)	0
			B)	2
			C)	3
			D)	1


21		Which of the following statements is TRUE?
			A)	To be diastereomers, a pair of molecules must have 2 or more chiral centers.
			B)	To be diastereomers, a pair of molecules must have at least 1 chiral center.
			C)	To be diastereomers, a pair of molecules must be stereoisomers.
			D)	To be diastereomers, a pair of molecules must be a racemate.


22		Shikimic acid is an important natural product. How many stereoisomers are possible for shikimic acid?
			A)	16
			B)	8
			C)	4
			D)	2


23		Consider the following two structures. What is their isomeric relationship to each other?
			A)	identical
			B)	enantiomers
			C)	diastereomers
			D)	constitutional isomers


24		Explain why the two stereoisomers of 1,4-dimethylcyclohexane are achiral?
			A)	because they are identical
			B)	because they are enantiomers
			C)	because they both have the same absolute configuration
			D)	because there are no stereocenters present in either molecule


25		How many stereoisomers are there for 1-ethyl-3-methylcyclohexane?
			A)	2
			B)	3
			C)	4
			D)	6


26		What is the relationship between (1R,2S)-dibromocyclohexane and (1S,2R)-dibromocyclohexane?
			A)	identical
			B)	enantiomers
			C)	diastereomers
			D)	constitutional isomers


27		What is the relationship between (1R,2S)-1-bromo-2-methylcyclohexane and (1S,2R)-1-bromo-2-methylcyclohexane?
			A)	identical
			B)	enantiomers
			C)	diastereomers
			D)	constitutional isomers


28		Which of the following may be separated by ordinary physical methods?
			A)	a pair of identical molecules
			B)	a pair of enantiomers
			C)	a pair of diastereomers
			D)	a pair of identical atoms


29		Which of the following may be separated by ordinary physical methods?
			A)	(R)-3-bromo-1-butene and (S)-3-bromo-1-butene
			B)	cis-2-bromo-2-butene and trans-2-bromo-2-butene
			C)	(2R,3S)-1,2-dibromobutane and (2S,3R)-1,2-dibromobutane
			D)	(R)-2-bromobutane and (S)-2-bromobutane


30		Consider the following two stereoisomers. How are they different?
			A)	They have different melting points.
			B)	They rotate plane-polarized light in opposite directions.
			C)	They have different solubilities in water.
			D)	They have different indices of refraction.

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