Multiple Choice Quiz

Multiple Choice Quiz

Multiple Choice Quiz


1		How many pi (π) electrons are present in the allyl cation?
			A)	1
			B)	2
			C)	3
			D)	4


2		Consider the following carbocations and their resonance hybrids. Which is the MOST stable carbocation?
			A)
			B)
			C)
			D)


3		Which of the following is the MOST stable carbocation?
			A)
			B)
			C)
			D)


4		Which of the following is the LEAST stable carbocation?
			A)
			B)
			C)
			D)


5		Which of the following structures is NOT a resonance structure of the others?
			A)
			B)
			C)
			D)


6		Which of the following resonance structures contributes the most to the resonance hybrid?
			A)
			B)
			C)
			D)


7		How many pi (π) electrons are there in the following molecule?
			A)	4
			B)	6
			C)	8
			D)	10


8		Which of the following is the MOST stable diene?
			A)
			B)
			C)
			D)


9		Which of the following compounds will have the longest wavelength absorption?
			A)
			B)
			C)
			D)


10		Which of the following compounds absorbs at the longest wavelength?
			A)	1,3,5-Hexatriene
			B)	1,3,5,7-Octatetraene
			C)	1,7-Diphenyl-1,3,5-heptatriene
			D)	1,6-Diphenyl-1,3,5-heptatriene


11		In comparing kinetic control to thermodynamic control for the reaction of butadiene and HCl, which of the following statements respresents kinetic control?
			A)	The intermediate is more stable and the product is more stable.
			B)	The intermediate is less stable and the product is more stable.
			C)	The intermediate is more stable and the product is less stable.
			D)	The intermediate is less stable and the product is less stable.


12		When 1,3-butadiene reacts with HCl, two products form: 3-chloro-1-butene and 1-chloro-2-butene. At low temperatures (–78˚C), which of the following statements is correct?
			A)	Thermodynamic control favors formation of 3-chloro-1-butene.
			B)	Kinetic control favors formation of 3-chloro-1-butene.
			C)	Thermodynamic control favors formation of 1-chloro-2-butene.
			D)	Kinetic control favors formation of 1-chloro-2-butene.


13		In the addition of HBr to 1,3-butadiene, one product is called the kinetic product and the other is called the thermodynamic product. Which of the following descriptors applies to the kinetic product? a) 1,2 product b) 1,4 product c) most stable d) least stable e) formed slowest f) formed fastest g) formed at low temperature h) formed at high temperature i) most substituted alkene j) least substituted alkene k) bromide attack at more substituted site l) bromide attack at least substituted site
			A)	a, c, e, g, j, l
			B)	b, c, f, g, i, l,
			C)	a, d, f, g, j, k
			D)	b, d, f, h, i, k


14		Which of the following statements regarding 1,2- or 1,4-conjugate addition of HBr to 1,3-butadiene is FALSE?
			A)	The kinetic product, 3-bromo-1-butene, arises from the more stable carbocation intermediate.
			B)	The thermodynamic product, 1-bromo-2-butene, is the more stable product.
			C)	The kinetic product is favored by carrying out the reaction at high temperature.
			D)	Formation of the two products arises from a common resonance stabilized carbocation intermediate.


15		How many products are expected from 1,2- or 1,4-addition of HBr to 1,3-pentadiene? Disregard stereoisomers.
			A)	2
			B)	3
			C)	4
			D)	5


16		Which of the following conjugated dienes gives a single product upon 1,2- or 1,4-addition of HCl?
			A)	Butadiene
			B)	2-Methylbutadiene
			C)	1,3-Cyclohexadiene
			D)	2,3-Dimethylbutadiene


17		How many different compounds are expected from 1,2- and 1,4-conjugate addition of HCl to vinylcyclohexene (V)? Disregard enantiomers, but don't forget cis–trans isomers.
			A)	4
			B)	5
			C)	6
			D)	7


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


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


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


21		What are the reactants needed to accomplish the following reaction?
			A)
			B)
			C)
			D)


22		What are the reactants needed to accomplish the following reaction?
			A)
			B)
			C)
			D)


23		Which of the following statements regarding the Diels–Alder reaction is TRUE?
			A)	The diene must be s-cis and the major product is the endo product.
			B)	The diene must be s-trans and the major product is the endo product.
			C)	The diene must be s-cis and the major product is the exo product.
			D)	The diene must be s-trans and the major product is the exo product.


24		Which of the following dienes is suitable as the diene component in a Diels–Alder reaction?
			A)	a
			B)	b
			C)	c
			D)	d

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