ORGANIC CHEMISTRY FINAL EXAM -
TRUE AND FALSE TYPE ANSWERS
SHORT AND PRECISE A+ GRADE
2027
Organic Chemistry True/False Revision Guide
1. Alkanes contain one sigma bond and one pi bond
FALSE
Reason: Alkanes contain only single (σ) bonds and no π bonds.
2. Petroleum contains carbon from dead plants and animals
TRUE
3. Valence electrons are important because they are near the nucleus
FALSE
Reason: Valence electrons are important because they are the outermost electrons involved in
bonding.
4. A substituent is a group of atom(s) that are substituted in place of one hydrogen on the
parent carbon chain
TRUE
5. The stronger the acid, the weaker is its conjugate base
TRUE
6. Arrhenius acids and bases only exist in aqueous solutions
TRUE
7. Fishhook arrows show the movement of two electrons
FALSE
Reason: Fishhook arrows represent the movement of one electron.
8. A nonpolar molecule cannot have polar covalent bonds
, FALSE
Reason: A molecule can contain polar bonds but still be nonpolar if bond dipoles cancel.
9. Electrophile is an electron-rich site of a molecule
FALSE
Reason: Electrophiles are electron-deficient species that accept electrons.
10. Exothermic reactions consume energy during the reaction
FALSE
Reason: Exothermic reactions release energy.
11. Achiral molecules cannot have stereocenters
FALSE
Reason: Meso compounds are achiral but contain stereocenters.
12.sAscarbocationsissasreactionsintermediate
TRUE
s
13.sResolutionsissusedsforsthesseparationsofsasracemicsmixture
TRUE
s
14.sCissalkenessareslesssstablesthanstranssisomers
TRUE
s
Reason:sTranssalkenessaresgenerallysmoresstablesduestosreducedsstericshindrance.
15.sForsIRsspectroscopy,sfunctionalsgroupssaresindicatedsmostlysbysbends
FALSE
s
Reason:sFunctionalsgroupssaresidentifiedsmainlysbysstretchingsvibrations.
16.sAlkenessaresunsaturatedscompounds
TRUE
s
17.sAsbenzenesringswithsans–CHOsbondedstositsissreferredstosassbenzoicsacid
FALSE
s
Reason:sItsisscalledsbenzaldehyde.
18.sZaitsev'ssrulesstatessthatsthesmostssubstitutedsalkenesissthesmajorsproductsinsansE1sreaction
TRUE AND FALSE TYPE ANSWERS
SHORT AND PRECISE A+ GRADE
2027
Organic Chemistry True/False Revision Guide
1. Alkanes contain one sigma bond and one pi bond
FALSE
Reason: Alkanes contain only single (σ) bonds and no π bonds.
2. Petroleum contains carbon from dead plants and animals
TRUE
3. Valence electrons are important because they are near the nucleus
FALSE
Reason: Valence electrons are important because they are the outermost electrons involved in
bonding.
4. A substituent is a group of atom(s) that are substituted in place of one hydrogen on the
parent carbon chain
TRUE
5. The stronger the acid, the weaker is its conjugate base
TRUE
6. Arrhenius acids and bases only exist in aqueous solutions
TRUE
7. Fishhook arrows show the movement of two electrons
FALSE
Reason: Fishhook arrows represent the movement of one electron.
8. A nonpolar molecule cannot have polar covalent bonds
, FALSE
Reason: A molecule can contain polar bonds but still be nonpolar if bond dipoles cancel.
9. Electrophile is an electron-rich site of a molecule
FALSE
Reason: Electrophiles are electron-deficient species that accept electrons.
10. Exothermic reactions consume energy during the reaction
FALSE
Reason: Exothermic reactions release energy.
11. Achiral molecules cannot have stereocenters
FALSE
Reason: Meso compounds are achiral but contain stereocenters.
12.sAscarbocationsissasreactionsintermediate
TRUE
s
13.sResolutionsissusedsforsthesseparationsofsasracemicsmixture
TRUE
s
14.sCissalkenessareslesssstablesthanstranssisomers
TRUE
s
Reason:sTranssalkenessaresgenerallysmoresstablesduestosreducedsstericshindrance.
15.sForsIRsspectroscopy,sfunctionalsgroupssaresindicatedsmostlysbysbends
FALSE
s
Reason:sFunctionalsgroupssaresidentifiedsmainlysbysstretchingsvibrations.
16.sAlkenessaresunsaturatedscompounds
TRUE
s
17.sAsbenzenesringswithsans–CHOsbondedstositsissreferredstosassbenzoicsacid
FALSE
s
Reason:sItsisscalledsbenzaldehyde.
18.sZaitsev'ssrulesstatessthatsthesmostssubstitutedsalkenesissthesmajorsproductsinsansE1sreaction
