OChem 2 Lab Final UTA Exam Questions with Correct Answers Latest Update 2025/2026
Polymers - Answers Class of molecules that consist of repeating structural units called
monomers
Homopolymers - Answers Polymers that consist of a single repeating monomer (M)
R-M-(M)n-M-R
Copolymers - Answers Polymers consisting of two distinct monomeric units, M1 and M2,
distributed at random in the polymer
R-M1-(M1-M2)n-M2-R
Chain Reaction Polymerization - Answers A chain reaction initiated by a cation, anion, or free
radical.
ex: polymerization of styrene to polystyrene [free radical polymerization]
Initiator in the Polymerization Rxn of Styrene - Answers tert-butyl peroxybenzoate, which upon
thermal decomposition produces the radicals necessary for .......?
Propagation - Answers Allows for growth of the polymer chain in free radical polymerization
Radical Scavenger - Answers Donates a hydrogen atom to reactive free radicals converting
them into non-radicals, such as preventing polymerization with trace amounts of oxygen
Tert-butylcatechol - Answers Radical Scavenger in Polymerization of Styrene?
-results in phenol radical that's relatively unreactive and doesn't act as an initiator
Removed - Answers tert-butylcatechol must be __________ from styrene prior to use (can use
basic solution to do so)
Acidic, Base - Answers 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)
Step-Growth Polymerization - Answers Involves a reaction between two different
difunctionalized monomers in which both functionalities react to form the polymer
,ex: Nylon 6,6 polymerization
Nylon-6,6 - Answers A type of polyamide prepared by reacting a diacid or diacid chloride and a
diamine, (such as Adipoyl chloride & Hexamethylenediamine reacting with NaOH)
Nucleophilic Substitution - Answers 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)
HCl & NaCl - Answers A molecule of ______ & _____ are eliminated as byproducts during
polymerization of Nylon-6,6 and is neutralized by a base
Organometallic Compounds - Answers 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
Would Not - Answers Metallic salts of carboxylic acids, phenols, alcohols, etc _________ be
defined as true organometallic compounds
Would Not - Answers Coordination compound of a transition metal with ex. ethylenediamine or
EDTA ______ be defined as true organometallic compounds
Main group and Transition - Answers Organometallic compounds are known for both ________
_________ and ___________ metal elements ex. Li, Mg, Cu, and Cd
Grignard Reagents - Answers 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
Addition to carbonyl compounds to produce alcohols - Answers The reaction we preformed
that's an example of one of the most familiar applications of Grignard Reagents was?
How Grignard Reagents are typically formed - Answers 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
Grignard Reactions - Answers 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
Reflux Condenser - Answers NEVER begin the formation of a Grignard reagent without using a
very efficient _______ ________ & always have an ice bath standing by
Order of Reactivity of Halogens - Answers I > Br > Cl > F
Diethyl Ether - Answers Solvent most commonly used in prep of Grignard reagents
How to Choose the Ether used in Grignard Reagents - Answers 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
Hydrocarbon solvents - Answers These are inert to Grignard reagents, but they're unsuitable
solvents because they do not dissolve the organomagnesium halides as they form
ex. benzene and hexane
Carbon- Magnesium Bond - Answers This bond of Grignard is covalent but quite polar with an
electron-rich carbon and electron-poor magnesium.
A synthetic equivalent of a carbanion
Carbon: more electronegative, nucleophilic
Magnesium: more positive, electrophilic
Bases - Answers As a consequence of the highly polar nature of the C-Mg bond is that Grignard
reagents are very powerful _______
Proton - Answers The ability of the Grignard Reagent to accept a ______ is an undesirable side
rxn which must be avoided since it destroys the reagent
Polymers - Answers Class of molecules that consist of repeating structural units called
monomers
Homopolymers - Answers Polymers that consist of a single repeating monomer (M)
R-M-(M)n-M-R
Copolymers - Answers Polymers consisting of two distinct monomeric units, M1 and M2,
distributed at random in the polymer
R-M1-(M1-M2)n-M2-R
Chain Reaction Polymerization - Answers A chain reaction initiated by a cation, anion, or free
radical.
ex: polymerization of styrene to polystyrene [free radical polymerization]
Initiator in the Polymerization Rxn of Styrene - Answers tert-butyl peroxybenzoate, which upon
thermal decomposition produces the radicals necessary for .......?
Propagation - Answers Allows for growth of the polymer chain in free radical polymerization
Radical Scavenger - Answers Donates a hydrogen atom to reactive free radicals converting
them into non-radicals, such as preventing polymerization with trace amounts of oxygen
Tert-butylcatechol - Answers Radical Scavenger in Polymerization of Styrene?
-results in phenol radical that's relatively unreactive and doesn't act as an initiator
Removed - Answers tert-butylcatechol must be __________ from styrene prior to use (can use
basic solution to do so)
Acidic, Base - Answers 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)
Step-Growth Polymerization - Answers Involves a reaction between two different
difunctionalized monomers in which both functionalities react to form the polymer
,ex: Nylon 6,6 polymerization
Nylon-6,6 - Answers A type of polyamide prepared by reacting a diacid or diacid chloride and a
diamine, (such as Adipoyl chloride & Hexamethylenediamine reacting with NaOH)
Nucleophilic Substitution - Answers 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)
HCl & NaCl - Answers A molecule of ______ & _____ are eliminated as byproducts during
polymerization of Nylon-6,6 and is neutralized by a base
Organometallic Compounds - Answers 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
Would Not - Answers Metallic salts of carboxylic acids, phenols, alcohols, etc _________ be
defined as true organometallic compounds
Would Not - Answers Coordination compound of a transition metal with ex. ethylenediamine or
EDTA ______ be defined as true organometallic compounds
Main group and Transition - Answers Organometallic compounds are known for both ________
_________ and ___________ metal elements ex. Li, Mg, Cu, and Cd
Grignard Reagents - Answers 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
Addition to carbonyl compounds to produce alcohols - Answers The reaction we preformed
that's an example of one of the most familiar applications of Grignard Reagents was?
How Grignard Reagents are typically formed - Answers 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
Grignard Reactions - Answers 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
Reflux Condenser - Answers NEVER begin the formation of a Grignard reagent without using a
very efficient _______ ________ & always have an ice bath standing by
Order of Reactivity of Halogens - Answers I > Br > Cl > F
Diethyl Ether - Answers Solvent most commonly used in prep of Grignard reagents
How to Choose the Ether used in Grignard Reagents - Answers 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
Hydrocarbon solvents - Answers These are inert to Grignard reagents, but they're unsuitable
solvents because they do not dissolve the organomagnesium halides as they form
ex. benzene and hexane
Carbon- Magnesium Bond - Answers This bond of Grignard is covalent but quite polar with an
electron-rich carbon and electron-poor magnesium.
A synthetic equivalent of a carbanion
Carbon: more electronegative, nucleophilic
Magnesium: more positive, electrophilic
Bases - Answers As a consequence of the highly polar nature of the C-Mg bond is that Grignard
reagents are very powerful _______
Proton - Answers The ability of the Grignard Reagent to accept a ______ is an undesirable side
rxn which must be avoided since it destroys the reagent
