OCHEM 2 LAB FINAL UTA EXAM
QUESTIONS AND ANSWERS 100% PASS
2026/2027
Class of molecules that consist of repeating structural units called monomers - ANS Polymers
Polymers that consist of a single repeating monomer (M)
R-M-(M)n-M-R - ANS Homopolymers
Polymers consisting of two distinct monomeric units, M1 and M2, distributed at random in the
polymer
R-M1-(M1-M2)n-M2-R - ANS Copolymers
A chain reaction initiated by a cation, anion, or free radical.
ex: polymerization of styrene to polystyrene [free radical polymerization] - ANS Chain
Reaction Polymerization
@2026 ALLRIGHTS RESERVED 1
,tert-butyl peroxybenzoate, which upon thermal decomposition produces the radicals necessary
for .......? - ANS Initiator in the Polymerization Rxn of Styrene
Allows for growth of the polymer chain in free radical polymerization - ANS Propagation
Donates a hydrogen atom to reactive free radicals converting them into non-radicals, such as
preventing polymerization with trace amounts of oxygen - ANS Radical Scavenger
Radical Scavenger in Polymerization of Styrene?
-results in phenol radical that's relatively unreactive and doesn't act as an initiator - ANS Tert-
butylcatechol
tert-butylcatechol must be __________ from styrene prior to use (can use basic solution to do
so) - ANS Removed
The phenolic H atoms on tert-butylcatechol are relatively _____ and can be deprotonated with
______ converting the phenol into a water-soluble phenolate salt (polymerization experiment) -
ANS Acidic, Base
Involves a reaction between two different difunctionalized monomers in which both
functionalities react to form the polymer
ex: Nylon 6,6 polymerization - ANS Step-Growth Polymerization
A type of polyamide prepared by reacting a diacid or diacid chloride and a diamine, (such as
Adipoyl chloride & Hexamethylenediamine reacting with NaOH) - ANS Nylon-6,6
@2026 ALLRIGHTS RESERVED 2
,Diacid chloride is commonly used in the lab because it's more reactive toward _________
___________ and milder reaction conditions can be used (during polymerization of Nylon-6,6) -
ANS Nucleophilic Substitution
A molecule of ______ & _____ are eliminated as byproducts during polymerization of Nylon-6,6
and is neutralized by a base - ANS HCl & NaCl
Extremely useful and versatile for synthesis
Substances in which there is a carbon-metal bond & doesn't include compounds in which metal
atoms are bonded to organic molecules through bonds to O,N,S,P, etc - ANS Organometallic
Compounds
Metallic salts of carboxylic acids, phenols, alcohols, etc _________ be defined as true
organometallic compounds - ANS Would Not
Coordination compound of a transition metal with ex. ethylenediamine or EDTA ______ be
defined as true organometallic compounds - ANS Would Not
Organometallic compounds are known for both ________ _________ and ___________ metal
elements ex. Li, Mg, Cu, and Cd - ANS Main group and Transition
Organomagnesium halides which are commonly prepared by a reaction between Magnesium
metal and alkyl or aryl halide
They're important for organic synthesis and are convenient precursors from which other other
organometallic compounds may be prepared - ANS Grignard Reagents
@2026 ALLRIGHTS RESERVED 3
, The reaction we preformed that's an example of one of the most familiar applications of
Grignard Reagents was? - ANS Addition to carbonyl compounds to produce alcohols
These are formed by exposure of an alkyl or aryl halide in diethyl ether solution to magnesium
metal, commonly in the form of Mg turnings or shavings - ANS How Grignard Reagents are
typically formed
These rxns are typically spontaneous and exothermic once induction sets in; the combination of
an exothermic rxn and a solvent can be very volatile and highly flammable
Do not add too much alkyl or aryl halide too early - ANS Grignard Reactions
NEVER begin the formation of a Grignard reagent without using a very efficient _______
________ & always have an ice bath standing by - ANS Reflux Condenser
I > Br > Cl > F - ANS Order of Reactivity of Halogens
Solvent most commonly used in prep of Grignard reagents - ANS Diethyl Ether
1) Grignard reagents are very reactive & the solvent chosen must be one which will not be
attacked by the reagents (rules out acetone, EtOH, ethyl acetate, acetonitrile, chloroform)
2) Solvent chosen must be one in which the Grignard reagent is soluble, otherwise the surface
of the solid Mg would be coated with the Grignard and shield the Mg surface from further
reaction - ANS How to Choose the Ether used in Grignard Reagents
These are inert to Grignard reagents, but they're unsuitable solvents because they do not
dissolve the organomagnesium halides as they form
@2026 ALLRIGHTS RESERVED 4
QUESTIONS AND ANSWERS 100% PASS
2026/2027
Class of molecules that consist of repeating structural units called monomers - ANS Polymers
Polymers that consist of a single repeating monomer (M)
R-M-(M)n-M-R - ANS Homopolymers
Polymers consisting of two distinct monomeric units, M1 and M2, distributed at random in the
polymer
R-M1-(M1-M2)n-M2-R - ANS Copolymers
A chain reaction initiated by a cation, anion, or free radical.
ex: polymerization of styrene to polystyrene [free radical polymerization] - ANS Chain
Reaction Polymerization
@2026 ALLRIGHTS RESERVED 1
,tert-butyl peroxybenzoate, which upon thermal decomposition produces the radicals necessary
for .......? - ANS Initiator in the Polymerization Rxn of Styrene
Allows for growth of the polymer chain in free radical polymerization - ANS Propagation
Donates a hydrogen atom to reactive free radicals converting them into non-radicals, such as
preventing polymerization with trace amounts of oxygen - ANS Radical Scavenger
Radical Scavenger in Polymerization of Styrene?
-results in phenol radical that's relatively unreactive and doesn't act as an initiator - ANS Tert-
butylcatechol
tert-butylcatechol must be __________ from styrene prior to use (can use basic solution to do
so) - ANS Removed
The phenolic H atoms on tert-butylcatechol are relatively _____ and can be deprotonated with
______ converting the phenol into a water-soluble phenolate salt (polymerization experiment) -
ANS Acidic, Base
Involves a reaction between two different difunctionalized monomers in which both
functionalities react to form the polymer
ex: Nylon 6,6 polymerization - ANS Step-Growth Polymerization
A type of polyamide prepared by reacting a diacid or diacid chloride and a diamine, (such as
Adipoyl chloride & Hexamethylenediamine reacting with NaOH) - ANS Nylon-6,6
@2026 ALLRIGHTS RESERVED 2
,Diacid chloride is commonly used in the lab because it's more reactive toward _________
___________ and milder reaction conditions can be used (during polymerization of Nylon-6,6) -
ANS Nucleophilic Substitution
A molecule of ______ & _____ are eliminated as byproducts during polymerization of Nylon-6,6
and is neutralized by a base - ANS HCl & NaCl
Extremely useful and versatile for synthesis
Substances in which there is a carbon-metal bond & doesn't include compounds in which metal
atoms are bonded to organic molecules through bonds to O,N,S,P, etc - ANS Organometallic
Compounds
Metallic salts of carboxylic acids, phenols, alcohols, etc _________ be defined as true
organometallic compounds - ANS Would Not
Coordination compound of a transition metal with ex. ethylenediamine or EDTA ______ be
defined as true organometallic compounds - ANS Would Not
Organometallic compounds are known for both ________ _________ and ___________ metal
elements ex. Li, Mg, Cu, and Cd - ANS Main group and Transition
Organomagnesium halides which are commonly prepared by a reaction between Magnesium
metal and alkyl or aryl halide
They're important for organic synthesis and are convenient precursors from which other other
organometallic compounds may be prepared - ANS Grignard Reagents
@2026 ALLRIGHTS RESERVED 3
, The reaction we preformed that's an example of one of the most familiar applications of
Grignard Reagents was? - ANS Addition to carbonyl compounds to produce alcohols
These are formed by exposure of an alkyl or aryl halide in diethyl ether solution to magnesium
metal, commonly in the form of Mg turnings or shavings - ANS How Grignard Reagents are
typically formed
These rxns are typically spontaneous and exothermic once induction sets in; the combination of
an exothermic rxn and a solvent can be very volatile and highly flammable
Do not add too much alkyl or aryl halide too early - ANS Grignard Reactions
NEVER begin the formation of a Grignard reagent without using a very efficient _______
________ & always have an ice bath standing by - ANS Reflux Condenser
I > Br > Cl > F - ANS Order of Reactivity of Halogens
Solvent most commonly used in prep of Grignard reagents - ANS Diethyl Ether
1) Grignard reagents are very reactive & the solvent chosen must be one which will not be
attacked by the reagents (rules out acetone, EtOH, ethyl acetate, acetonitrile, chloroform)
2) Solvent chosen must be one in which the Grignard reagent is soluble, otherwise the surface
of the solid Mg would be coated with the Grignard and shield the Mg surface from further
reaction - ANS How to Choose the Ether used in Grignard Reagents
These are inert to Grignard reagents, but they're unsuitable solvents because they do not
dissolve the organomagnesium halides as they form
@2026 ALLRIGHTS RESERVED 4
