Question 1

Which one of the following is a true statement?

Accepted Answer

A) The stronger the acid,the larger is its pKa. 
B) The conjugate base of a strong acid is a strong base. 
C) Acid-base reactions always favor the formation of the stronger acid and the stronger base. 
D) Strong acids can have negative pKa values. 
E) Hydrogen need not be present in the molecular formula of a Bronsted-Lowry acid. 
A) The stronger the acid,the larger is its pKa. 
B) The conjugate base of a strong acid is a strong base. 
C) Acid-base reactions always favor the formation of the stronger acid and the stronger base. 
D) Strong acids can have negative pKa values. 
E) Hydrogen need not be present in the molecular formula of a Bronsted-Lowry acid. D

Question 2

Which of the acids below would have the strongest conjugate base?

Accepted Answer

A) CH3CH2OH pKa = 18 
B) CH3CO2H pKa = 4.75 
C) ClCH2CO2H pKa = 2.81 
D) Cl2CHCO2H pKa = 1.29 
E) Cl3CCO2H pKa = 0.66 
A) CH3CH2OH pKa = 18 
B) CH3CO2H pKa = 4.75 
C) ClCH2CO2H pKa = 2.81 
D) Cl2CHCO2H pKa = 1.29 
E) Cl3CCO2H pKa = 0.66 A

Question 3

According to Bronsted-Lowry theory,an acid is a substance that can ___.

Accepted Answer

donate a proton

Question 4

The strongest acid that can exist in an aqueous solution is the hydronium ion H3O+.

Accepted Answer

A) True 
 B)False

Question 5

Write an equation that shows the reaction between acetic acid (CH3COOH)and triethylamine (CH3CH2)3N.Draw all non-bonding lone electron pairs and show the electron flow with curved arrows.

Accepted Answer

Question 6

Which reaction of these potential acids and bases does not occur to any appreciable degree due to an unfavorable equilibrium?

Accepted Answer

A) NaNH2 + CH3CH2CH2CH2CH2CH3 
B) CH3CH2CO2Na + HI 
C) CH3Li in hexane + ethyne 
D) NaH + methanol 
E) Two of these choices will not occur. 
A) NaNH2 + CH3CH2CH2CH2CH2CH3 
B) CH3CH2CO2Na + HI 
C) CH3Li in hexane + ethyne 
D) NaH + methanol 
E) Two of these choices will not occur.

Question 7

In the following reaction,which chemical species is acting like an electrophile?

Accepted Answer

A)    
B)    
C) CH3O- 
D) two of these choices 
E) there is no electrophile in this reaction 
A)    
B)    
C) CH3O- 
D) two of these choices 
E) there is no electrophile in this reaction

Question 8

What prediction can be made of the relative strengths of the conjugate bases of: H2S,HCl,SiH4,PH3?

Accepted Answer

A) PH2- > SiH3- > HS- > Cl- 
B) SiH3- > PH2- > HS- > Cl- 
C) Cl- > HS- > PH2- > SiH3- 
D) HS- > Cl- > SiH3- > PH2- 
E) Cl- > PH2- > SiH3- > HS- 
A) PH2- > SiH3- > HS- > Cl- 
B) SiH3- > PH2- > HS- > Cl- 
C) Cl- > HS- > PH2- > SiH3- 
D) HS- > Cl- > SiH3- > PH2- 
E) Cl- > PH2- > SiH3- > HS-

Question 9

For the following acid / base reaction which statement is true taking $\Delta$S into consideration?

Accepted Answer

A) The reaction is an endothermic reaction and $\Delta$S is approximately zero. 
B) The reaction is an endothermic reaction and $\Delta$S is negative. 
C) The reaction is an exothermic reaction and $\Delta$S is negative. 
D) The reaction is an exothermic reaction and $\Delta$S is approximately zero. 
E) None of these choices. 
A) The reaction is an endothermic reaction and $\Delta$S is approximately zero. 
B) The reaction is an endothermic reaction and $\Delta$S is negative. 
C) The reaction is an exothermic reaction and $\Delta$S is negative. 
D) The reaction is an exothermic reaction and $\Delta$S is approximately zero. 
E) None of these choices.

Question 10

What is/are the product(s)of the following acid-base mechanism?

Accepted Answer

A)    
B)    
C)    
D)    
E) None of these choices. 
A)    
B)    
C)    
D)    
E) None of these choices.

Question 11

For the following acid/base reaction which statement is true taking $\Delta$S into consideration?

Accepted Answer

A) The reaction is an endothermic reaction and $\Delta$S is approximately zero. 
B) The reaction is an endothermic reaction and $\Delta$S is negative. 
C) The reaction is an exothermic reaction and $\Delta$S is negative. 
D) The reaction is an exothermic reaction and $\Delta$S is approximately zero. 
E) None of these choices. 
A) The reaction is an endothermic reaction and $\Delta$S is approximately zero. 
B) The reaction is an endothermic reaction and $\Delta$S is negative. 
C) The reaction is an exothermic reaction and $\Delta$S is negative. 
D) The reaction is an exothermic reaction and $\Delta$S is approximately zero. 
E) None of these choices.

Question 12

Which is an incorrect statement?

Accepted Answer

A) RSH compounds are stronger acids than ROH compounds. 
B) PH3 is a weaker base than NH3. 
C) NH2- is a stronger base than OH-. 
D) OH- is a stronger base than OR-. 
E) H- is a stronger base than OR-. 
A) RSH compounds are stronger acids than ROH compounds. 
B) PH3 is a weaker base than NH3. 
C) NH2- is a stronger base than OH-. 
D) OH- is a stronger base than OR-. 
E) H- is a stronger base than OR-.

Question 13

For the following acid / base reaction which statement is true taking $\Delta$H into consideration?

Accepted Answer

A) The reaction is an exothermic reaction and $\Delta$H is approximately zero. 
B) The reaction is an endothermic reaction and $\Delta$H is negative. 
C) The reaction is an exothermic reaction and $\Delta$H is negative. 
D) The reaction is an exothermic reaction and $\Delta$H is positive. 
E) None of these choices. 
A) The reaction is an exothermic reaction and $\Delta$H is approximately zero. 
B) The reaction is an endothermic reaction and $\Delta$H is negative. 
C) The reaction is an exothermic reaction and $\Delta$H is negative. 
D) The reaction is an exothermic reaction and $\Delta$H is positive. 
E) None of these choices.

Question 14

What compounds are produced when NaSH is added to a mixture of water and methanol?

Accepted Answer

A) NaOH + NaOCH3 + H2S 
B) H3O+ + Na2S + NaOCH3 
C) H2SO4 + NaOCH3 
D) H3O+ + NaOH + CH3SH 
E) No reaction occurs 
A) NaOH + NaOCH3 + H2S 
B) H3O+ + Na2S + NaOCH3 
C) H2SO4 + NaOCH3 
D) H3O+ + NaOH + CH3SH 
E) No reaction occurs

Question 15

Rank the bold-faced hydrogens for the following compounds from most acidic to least acidic.

Accepted Answer

A) III > II > IV > V > I 
B) II > III > V > IV > I 
C) II > V > III > IV > I 
D) V > III > II > IV > I 
E) I > IV > II > III > V 
A) III > II > IV > V > I 
B) II > III > V > IV > I 
C) II > V > III > IV > I 
D) V > III > II > IV > I 
E) I > IV > II > III > V

Question 16

Which is the strongest acid?

Accepted Answer

A) CH3CH2OH 
B) CH3CO2H 
C) HC$\equiv$CH 
D) CH2=CH2 
E) CH3CH3 
A) CH3CH2OH 
B) CH3CO2H 
C) HC$\equiv$CH 
D) CH2=CH2 
E) CH3CH3

Question 17

For the following acid/base reaction which statement is true taking $\Delta$S into consideration?

Accepted Answer

A) "$\Delta$G is negative and $\Delta$S is approximately zero" 
B) "$\Delta$G is negative and $\Delta$S is negative" 
C) "$\Delta$G is positive and $\Delta$S is positive" 
D) "$\Delta$G is negative and $\Delta$S is positive" 
E) "None of these choices." 
A) "$\Delta$G is negative and $\Delta$S is approximately zero" 
B) "$\Delta$G is negative and $\Delta$S is negative" 
C) "$\Delta$G is positive and $\Delta$S is positive" 
D) "$\Delta$G is negative and $\Delta$S is positive" 
E) "None of these choices."

Question 18

Rank the bold-faced hydrogens for the following compounds from most acidic to least acidic.

Accepted Answer

A) I > II > III > IV > V 
B) II > V > III > I > IV 
C) II > III > V > I > IV 
D) III > I > V > II > IV 
E) V > II > III > I > IV 
A) I > II > III > IV > V 
B) II > V > III > I > IV 
C) II > III > V > I > IV 
D) III > I > V > II > IV 
E) V > II > III > I > IV

Question 19

As a consequence of the "leveling effect," the strongest acid which can exist in appreciable concentration in aqueous solution is:

Accepted Answer

A) H3O+ 
B) H2SO4 
C) HClO4 
D) HCl 
E) HNO3 
A) H3O+ 
B) H2SO4 
C) HClO4 
D) HCl 
E) HNO3

Question 20

Which of the reaction conditions would not afford the following transformation?

Accepted Answer

A) (CH3)2NH 
B) (CH3)3N 
C) (CH3)2NLi 
D) More than one of these choices. 
E) None of these choices. 
A) (CH3)2NH 
B) (CH3)3N 
C) (CH3)2NLi 
D) More than one of these choices. 
E) None of these choices.

Exam 3: Acids and Bases

Which one of the following is a true statement?

Which of the acids below would have the strongest conjugate base?

According to Bronsted-Lowry theory,an acid is a substance that can ___.

The strongest acid that can exist in an aqueous solution is the hydronium ion H3O+.

Write an equation that shows the reaction between acetic acid (CH3COOH)and triethylamine (CH3CH2)3N.Draw all non-bonding lone electron pairs and show the electron flow with curved arrows.

Which reaction of these potential acids and bases does not occur to any appreciable degree due to an unfavorable equilibrium?

In the following reaction,which chemical species is acting like an electrophile?

What prediction can be made of the relative strengths of the conjugate bases of: H2S,HCl,SiH4,PH3?

For the following acid / base reaction which statement is true taking Δ\DeltaΔ S into consideration?

What is/are the product(s)of the following acid-base mechanism?

For the following acid/base reaction which statement is true taking Δ\DeltaΔ S into consideration?

Which is an incorrect statement?

For the following acid / base reaction which statement is true taking Δ\DeltaΔ H into consideration?

What compounds are produced when NaSH is added to a mixture of water and methanol?

Rank the bold-faced hydrogens for the following compounds from most acidic to least acidic.

Which is the strongest acid?

For the following acid/base reaction which statement is true taking Δ\DeltaΔ S into consideration?

Rank the bold-faced hydrogens for the following compounds from most acidic to least acidic.

As a consequence of the "leveling effect," the strongest acid which can exist in appreciable concentration in aqueous solution is:

Which of the reaction conditions would not afford the following transformation?

The Basics

Families of Carbon

Nomenclature and Conformations of Alkanes and Cycloalkanes

Stereochemistry

Nucleophilic Reactions

Alkenes and Alkynes I

Alkenes and Alkynes II

Nuclear Magnetic Resonance and Mass Spectrometry

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Reactions at the Α Carbon of Carbonyl Compounds

Condensation and Conjugate Addition Reactions of Carbonyl Compounds

Amines

Transition Metal Complexes

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

The strongest acid that can exist in an aqueous solution is the hydronium ion H₃O⁺.

Write an equation that shows the reaction between acetic acid (CH₃COOH)and triethylamine (CH₃CH₂)₃N.Draw all non-bonding lone electron pairs and show the electron flow with curved arrows.

What prediction can be made of the relative strengths of the conjugate bases of: H₂S,HCl,SiH₄,PH₃?

For the following acid / base reaction which statement is true taking $\Delta$ S into consideration? $For the following acid / base reaction which statement is true taking \Delta S into consideration?$

For the following acid/base reaction which statement is true taking $\Delta$ S into consideration? $For the following acid/base reaction which statement is true taking \Delta S into consideration?$

For the following acid / base reaction which statement is true taking $\Delta$ H into consideration? $For the following acid / base reaction which statement is true taking \Delta H into consideration?$

For the following acid/base reaction which statement is true taking $\Delta$ S into consideration? $For the following acid/base reaction which statement is true taking \Delta S into consideration?$