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CHEM l 219 l / l CHEM21 9 l Module l 8 : l
(NEW l 2025/ l 2026 l Update) l Principles l of l
Organic l Chemistry l W/ l Lab l | l Questions l
& l Answers| l Grade l A| l 100% l Correct l
(Verified l Solutions)- l Portage l Learning
QUESTION
T/Fl i)l inl thel chainl endl controll methodl ofl controllingl polymerl stereochemistry,l thel precedingl chirall centerl influencesl howl thel nextl onel isl formed ii)l Inl thel sitel controll methodl ofl controllingl stereochemistry,l thel specificl shapel ofl thel reagentl orl catalystl thatl facilitatesl thel reactionl alsol determinesl thel stereochemistry Answer: i)l true ii)l true
QUESTION
Describel thel followingl homopolymersl chainl sequencesl asl beingl linear,l branched,l orl crossl linked
Answer: crossl linked branched liner
QUESTION
polymersl propertiesl arel affectedl by Answer: 1)l molecularl weight 2)l amountl ofl branchingl 3)l molecularl weightl distribution
radicall coupling Answer: whenl twol radicall combinel usingl thel unpairedl electronl tol forml al newl covalentl bond
QUESTION
radicall disproportionation Answer: occursl whenl onel radicall abstractsl (removes)l al hydrogenl froml anotherl radicall species.
QUESTION
Homolyzed Answer: brokenl sol thatl eachl atoml joinedl byl thel bondl getsl onel ofl thel twol electronsl inl thel bond
QUESTION
reactionl typesl ofl chainl growth Answer: freel radical,l cationic,l anionic
QUESTION
naturall polymer Answer: Polymersl madel byl plantsl andl animals,l includingl wool,l cotton,l andl rubber. akal biopolymer
QUESTION
syntheticl polymer Answer: createdl inl labl andl knownl asl plastics
QUESTION
polymer
QUESTION
Describel thel majorl differencel inl thel formationl ofl additionl polymersl versusl condensationl polymers. Answer: Additionl polymers:l thel finall polymerl containsl alll ofl thel atomsl ofl thel monomerl becausel theyl arel madel byl onel monomersl addedl tol anotherl onel afterl another.l Condensationl polymers:l thel finall polymerl chainl doesl notl holdl alll ofl thel atomsl becausel theyl arel formedl froml twol differentl functionall groupsl andl differentl monomers.
QUESTION
Listl inl orderl ofl occurrencel thel namesl ofl thel threel stepsl ofl al radicall chainl reaction Answer: 1)l initiationl 2)l propagationl 3)l termination
QUESTION
Matchl thel terml describingl thel differentl waysl ofl arrangingl twol differentl typesl ofl monomersl intol al copolymerl tol tisl correctl description
Answer: Randoml copolymer:l thel monomericl unitsl arel distributedl randomly,l andl sometimesl unevenlyl Alternatingl copolymers:l thel monomericl unitsl arel distributedl inl al regularl alternatingl fashionl withl nearlyl equimolarl amounts Blockl copolymers:l al longl sequencel orl blockl ofl onel monomerl isl joinedl tol al blockl ofl thel secondl monomer Graftl copolymers:l sidel chainsl ofl al givenl monomerl arel attachedl tol thel mainl chainl ofl thel secondl monomer
QUESTION
Forl thel polymerl chainl shownl below,l labell thel chainl asl being:l i)l atactic,l isotactic,l syndiotacticl ii)l stereol regularl orl stereol random Answer: i)l isotacticl ii)l stereoregular
QUESTION
partl iil ofl questionl Answer: i)l Syndiotactic ii)l stereol regular
QUESTION
Forl eachl copolymerl sequencel shownl below,l characterizel itl usingl thel correctl terml whichl describedl thel arrangementl ofl thel twol differentl monomersl (representedl byl lettersl Al andl B)l present.l Usel thel termsl random,l alternating,l block,l orl graftl tol describel eachl sequence. Answer:
1)l alternatingl 2)l random 3)l block 4)l graft
QUESTION
Matchl thel namel ofl eachl terml describingl thel stereochemicall orientationl inl al polymerl chainl tol itsl correctl definition Answer: Atactic:l stereocentersl havel randoml configurationsl Isotactic:l alll stereocentersl havel thel samel configurationl Syndiotactic:l stereocentersl alternatel inl configuration
QUESTION
Al terml thatl describel whenl thel chainsl ofl polymerl moleculel arel arrangedl inl al randoml manner,l notl regularlyl alignedl inl al crystal. Answer: amorphous
