Organic Chemistry Module 3 Final Exam CHEM 219,
CHEM 219 EXAM 1 LATEST 2025 UPDATE WITH
COMPLETE QUESTIONS AND CORRECTLY WELL
DEFINED ANSWERS 100%GUARANTEED PASS!!!
Reaction Check List - answers is :SN1: ∧Nucl, ∨Base - 3°>, Protic (not 1°)
SN2: ∧Nucl, ∨Base - 1°>, Aprotic, (not 3°)
E1: Bulky/Nonnucl. Base - 3°>, ∨Base, Protic, (not 1°)
E2: Bulky/Nonnucl. Base - 3°>, ∧Base, Aprotic, (not 1°)
When determining the more stable stereoisomer (to find the major product),
what are 4 possible areas to look at? - answers is :1) If E2: Have to be
anti-periplanar
2) If E1: Determine the more stable carbocation by higher R substitution
3) Alkene more stable when more R groups
4) Trans > Cis
Alkyne Synthesis is done with what type of reaction mechanism? How? -
answers is :E2; two successive dehydrohalogenation (E2) reactions
What ways can you gather enough information to rank substances by
basicity? - answers is :1) strongest acid → weakest (conj.) base 2) As pKa
of H-A gets smaller, the basicity of -A: increases 3) As Ka of H-A gets
larger, the weaker the -A:
Definition of Lewis Acid - answers is :electron pair acceptor; any e-
deficient species that is capable of accepting an e- pair is a Lewis Acid; any
molecule or ionic species that can form new covalent bond by accepting an
e- pair; all BL acids are Lewis acids, but reverse is not necessarily true
Definition of Lewis Base - answers is :electron pair donor; structurally
same as BL base (both have e- pair); unlike BL base, Lewis can donate
pair to anything electron deficient; any molecule or ionic species that can
form a new covalent bond by donating an e- pair.
, Definition of B-L Acid. What requirements must they have? Give its symbol.
- answers is :a proton donor; must contain hydrogen; H-A
Definition of B-L Base. What requirements must they have? Give its
symbol. - answers is :A proton acceptor; must contain available e- pair (LP
or π); B:
Any reaction in qhich one species donates an electron pair to another
species is a _____________. - answers is :Lewis Acid-Base Reaction
What is the rule to being able to determine if a base is strong enough to
deprotonate (ionize) a given acid? - answers is :an acid can be
deprotonated by the conjugate base of any acid having a higher pKa (pKa
of equal value will not cause deprotonation)
Which has properties to be more acidic than the other between: Br & S
(EN, size, etc.) - answers is :Br has higher EN and is more acidic if
compared to similar molecule with S
Which has properties to be more acidic than the other between: O & Cl
(EN, size, etc.) - answers is :O has higher EN and is more acidic if
compared to similar molecule with Cl
How to determine which hydrogen is most acidic... - answers is :look at all
elements bonded to H within that molecule. Whichever hydrogen is
connected to the one with the highest EN will be the one that is most acidic.
When is the only time size matters and needs to be taken into account? -
answers is :When the specific atom being looked at is directly bonded to
the acidic hydrogen
What 2 things to be careful on when working LB Acid-Base Rxns with
possible inductive effects... - answers is :Size does not matter, because
electron withdrawing 'group' is not directly connected to the acidic
hydrogen. ONLY WORRY LOOK AT ELECTRONEGATIVITY! EN of
withdrawing group can only carry up to 5 bonds.
When looking at resonance effect, make sure to remember do what? -
answers is :only draw resonance structures for the conjugate bases!
CHEM 219 EXAM 1 LATEST 2025 UPDATE WITH
COMPLETE QUESTIONS AND CORRECTLY WELL
DEFINED ANSWERS 100%GUARANTEED PASS!!!
Reaction Check List - answers is :SN1: ∧Nucl, ∨Base - 3°>, Protic (not 1°)
SN2: ∧Nucl, ∨Base - 1°>, Aprotic, (not 3°)
E1: Bulky/Nonnucl. Base - 3°>, ∨Base, Protic, (not 1°)
E2: Bulky/Nonnucl. Base - 3°>, ∧Base, Aprotic, (not 1°)
When determining the more stable stereoisomer (to find the major product),
what are 4 possible areas to look at? - answers is :1) If E2: Have to be
anti-periplanar
2) If E1: Determine the more stable carbocation by higher R substitution
3) Alkene more stable when more R groups
4) Trans > Cis
Alkyne Synthesis is done with what type of reaction mechanism? How? -
answers is :E2; two successive dehydrohalogenation (E2) reactions
What ways can you gather enough information to rank substances by
basicity? - answers is :1) strongest acid → weakest (conj.) base 2) As pKa
of H-A gets smaller, the basicity of -A: increases 3) As Ka of H-A gets
larger, the weaker the -A:
Definition of Lewis Acid - answers is :electron pair acceptor; any e-
deficient species that is capable of accepting an e- pair is a Lewis Acid; any
molecule or ionic species that can form new covalent bond by accepting an
e- pair; all BL acids are Lewis acids, but reverse is not necessarily true
Definition of Lewis Base - answers is :electron pair donor; structurally
same as BL base (both have e- pair); unlike BL base, Lewis can donate
pair to anything electron deficient; any molecule or ionic species that can
form a new covalent bond by donating an e- pair.
, Definition of B-L Acid. What requirements must they have? Give its symbol.
- answers is :a proton donor; must contain hydrogen; H-A
Definition of B-L Base. What requirements must they have? Give its
symbol. - answers is :A proton acceptor; must contain available e- pair (LP
or π); B:
Any reaction in qhich one species donates an electron pair to another
species is a _____________. - answers is :Lewis Acid-Base Reaction
What is the rule to being able to determine if a base is strong enough to
deprotonate (ionize) a given acid? - answers is :an acid can be
deprotonated by the conjugate base of any acid having a higher pKa (pKa
of equal value will not cause deprotonation)
Which has properties to be more acidic than the other between: Br & S
(EN, size, etc.) - answers is :Br has higher EN and is more acidic if
compared to similar molecule with S
Which has properties to be more acidic than the other between: O & Cl
(EN, size, etc.) - answers is :O has higher EN and is more acidic if
compared to similar molecule with Cl
How to determine which hydrogen is most acidic... - answers is :look at all
elements bonded to H within that molecule. Whichever hydrogen is
connected to the one with the highest EN will be the one that is most acidic.
When is the only time size matters and needs to be taken into account? -
answers is :When the specific atom being looked at is directly bonded to
the acidic hydrogen
What 2 things to be careful on when working LB Acid-Base Rxns with
possible inductive effects... - answers is :Size does not matter, because
electron withdrawing 'group' is not directly connected to the acidic
hydrogen. ONLY WORRY LOOK AT ELECTRONEGATIVITY! EN of
withdrawing group can only carry up to 5 bonds.
When looking at resonance effect, make sure to remember do what? -
answers is :only draw resonance structures for the conjugate bases!
