Stereoselectivity, Stereospecificity and Stereo Structure of Polymers MCQs

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).  Syndiotactic

(B).  Isotactic

(C).  Atactic

(D).  Multitactic

(E). None of these

Multiple Choice Question Answer:  b

This is an example of which one? on reaction with NaOH, (S)-2-bromo octane gives (R)-2-octanol under S_N2 conditions.

(A).  Stereospecific

(B).  Dynamicselective

(C).  Regioselective

(D).  Stereoselective

(E). None of these

Multiple Choice Question Answer:  a

The polymer chain consisting of which one monomeric unit, the tactic dyad has a segment of?

(A).  5

(B).  3

(C).  4

(D).  2

(E). None of these

Multiple Choice Question Answer:  d

Which of the following is the reaction which gives exclusively one of several possible isomeric products?

(A).  Dynamicselective

(B).  Stereoselective

(C).  Regioselective

(D).  Stereospecific

(E). None of these

Multiple Choice Question Answer:  c

In various degrees, stereoselectivity can be exhibited.

(A).  True

(B).  False

(E). None of these

Multiple Choice Question Answer:  a

____ is an example of regioselective reaction.

(A).  Debromination of 2,3- dibromobutane

(B).  Addition of HI for propylening

(C).  Debromination of meso dibromobutane

(D).  with sodium hydroxide 2-bromo octane

(E). None of these

Multiple Choice Question Answer:  b

In correlating conformation and reactivity and in stereoselective synthesis dynamic stereochemistry helps.

(A).  True

(B).  False

(E). None of these

Multiple Choice Question Answer:  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).  Regioselective

(B).  Dynamicselective

(C).  Stereoselective

(D).  Stereospecific

(E). None of these

Multiple Choice Question Answer:  c

Atactic polymer is that in _____

(A).  the same configuration alternate chiral centres have

(B).  the same configuration every third chiral centre has

(C ).  the same configuration each chiral centre has

(D).  configuration is there a completely random distribution of

(E). None of these

Multiple Choice Question Answer:  d

Which of the following is the reaction that yields predominantly one enantiomer of a possible pair?

(A).  Dynamicselective

(B).  Stereoselective

(C).  Regioselective

(D).  Stereospecific

(E). None of these

Multiple Choice Question Answer:  b

Which of the following the formula of enantiomeric excess?

(A).  [(d+l)/(d-l)]*100

(B). [(d-l)/(d)]*100

(C). [(d)/(d+l)]*100

(D).  [(d-l)/(d+l)]*100

(E). None of these

Multiple Choice Question Answer:  B

Which of the following is the reaction of (±) 2,3- dibromobutane is slower than meso in which the two methyl groups?

(A).  Skew

(B).  Gauche

(C).  Partially eclipsed

(D).  Anti

(E). None of these

Multiple Choice Question Answer:  c

On reaction with NaOH under S_N2 conditions, (R)-2-bromo octane gives which one?

(A).  Trans-2-butene

(B). (S)-2-octanol

(C).  Cis-2-butene

(D).  (R)-2-octanol

(E). None of these

Multiple Choice Question Answer:  B

Which one of the following is the polymer in which alternate chiral centres have the same configuration?

(A).  Syndiotactic

(B).  Atactic

(C).  Isotactic

(D).  Multitactic

(E). None of these

Multiple Choice Question Answer:  a

__________ scientists won the noble prize for working in polymer stereochemistry.

(A).  Zeigler and Natta

(B).  Peter Agre and Agricola

(C).  Kurt Alder and Richard Abegg

(D).  Friedrich Accum

(E). None of these

Multiple Choice Question Answer:  a

For a polymer to adopt crystalline morphology increases with which one stereo regularity the tendency?

(A).  Increasing

(B).  First decreasing then increasing

(C).  First increasing then decreasing

(D).  Decreasing

(E). None of these

Multiple Choice Question Answer:  a

Which one of the following is the configuration of the isotactic dyad?

(A).  Rectus

(B).  Racemic

(C).  Chiral

(D).  Meso

(E). None of these

Multiple Choice Question Answer:  d

.Which of the following is the reaction in which stereochemically different molecules react differently?

(A).  Dynamicselective

(B).  Regioselective

(C).  Stereospecific

(D).  Stereoselective

(E). None of these

Multiple Choice Question Answer:  c

 

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