Stereoselectivity, Stereospecificity and Stereo Structure of Polymers MCQs
Which one of the following is the polymer when each chiral centre has the same configuration?
(A). Â Syndiotactic
(B). Â Isotactic
(C). Â Atactic
(D). Â Multitactic
(E). None of these
Multiple Choice Question Answer: Â b
This is an example of which one? on reaction with NaOH, (S)-2-bromo octane gives (R)-2-octanol under SN2 conditions.
(A). Â Stereospecific
(B). Â Dynamicselective
(C). Â Regioselective
(D). Â Stereoselective
(E). None of these
Multiple Choice Question Answer: Â a
The polymer chain consisting of which one monomeric unit, the tactic dyad has a segment of?
(A). Â 5
(B). Â 3
(C). Â 4
(D). Â 2
(E). None of these
Multiple Choice Question Answer: Â d
Which of the following is the reaction which gives exclusively one of several possible isomeric products?
(A). Â Dynamicselective
(B). Â Stereoselective
(C). Â Regioselective
(D). Â Stereospecific
(E). None of these
Multiple Choice Question Answer: Â c
In various degrees, stereoselectivity can be exhibited.
(A). Â True
(B). Â False
(E). None of these
Multiple Choice Question Answer: Â a
____ is an example of regioselective reaction.
(A). Â Debromination of 2,3- dibromobutane
(B). Â Addition of HI for propylening
(C). Â Debromination of meso dibromobutane
(D). Â with sodium hydroxide 2-bromo octane
(E). None of these
Multiple Choice Question Answer: Â b
In correlating conformation and reactivity and in stereoselective synthesis dynamic stereochemistry helps.
(A). Â True
(B). Â False
(E). None of these
Multiple Choice Question Answer: Â a
This is an example of which one? for giving a syn product R – C = C – R reacts in the presence of linear catalyst.
(A). Â Regioselective
(B). Â Dynamicselective
(C). Â Stereoselective
(D). Â Stereospecific
(E). None of these
Multiple Choice Question Answer: Â c
Atactic polymer is that in _____
(A). Â the same configuration alternate chiral centres have
(B). Â the same configuration every third chiral centre has
(C ). Â the same configuration each chiral centre has
(D). Â configuration is there a completely random distribution of
(E). None of these
Multiple Choice Question Answer: Â d
Which of the following is the reaction that yields predominantly one enantiomer of a possible pair?
(A). Â Dynamicselective
(B). Â Stereoselective
(C). Â Regioselective
(D). Â Stereospecific
(E). None of these
Multiple Choice Question Answer:Â b
Which of the following the formula of enantiomeric excess?
(A). Â [(d+l)/(d-l)]*100
(B). [(d-l)/(d)]*100
(C). [(d)/(d+l)]*100
(D). Â [(d-l)/(d+l)]*100
(E). None of these
Multiple Choice Question Answer:Â B
Which of the following is the reaction of (±) 2,3- dibromobutane is slower than meso in which the two methyl groups?
(A). Â Skew
(B). Â Gauche
(C). Â Partially eclipsed
(D). Â Anti
(E). None of these
Multiple Choice Question Answer: Â c
On reaction with NaOH under SN2 conditions, (R)-2-bromo octane gives which one?
(A). Â Trans-2-butene
(B). (S)-2-octanol
(C). Â Cis-2-butene
(D). (R)-2-octanol
(E). None of these
Multiple Choice Question Answer: Â B
Which one of the following is the polymer in which alternate chiral centres have the same configuration?
(A). Â Syndiotactic
(B). Â Atactic
(C). Â Isotactic
(D). Â Multitactic
(E). None of these
Multiple Choice Question Answer: Â a
__________ scientists won the noble prize for working in polymer stereochemistry.
(A). Â Zeigler and Natta
(B). Â Peter Agre and Agricola
(C). Â Kurt Alder and Richard Abegg
(D). Â Friedrich Accum
(E). None of these
Multiple Choice Question Answer: Â a
For a polymer to adopt crystalline morphology increases with which one stereo regularity the tendency?
(A). Â Increasing
(B). Â First decreasing then increasing
(C). Â First increasing then decreasing
(D). Â Decreasing
(E). None of these
Multiple Choice Question Answer: Â a
Which one of the following is the configuration of the isotactic dyad?
(A). Â Rectus
(B). Â Racemic
(C). Â Chiral
(D). Â Meso
(E). None of these
Multiple Choice Question Answer: Â d
.Which of the following is the reaction in which stereochemically different molecules react differently?
(A). Â Dynamicselective
(B). Â Regioselective
(C). Â Stereospecific
(D). Â Stereoselective
(E). None of these
Multiple Choice Question Answer:Â c
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