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Exam 2: Acids and Bases

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Question 21

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Rank the following compounds in order of decreasing acidity, putting the most acidic first. $\begin{array} {llll}\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OH }&\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { NH } _ { 2 }&\mathrm { ClCH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { OH }\\\text { I }&\text { II } &\text { III } \\ \end{array}$

A) I > II > III
B) III > II > I
C) II > III > I
D) III > I > II

E) None of the above
F) B) and C)

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Question 22

Multiple Choice

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What is the direction of equilibrium when acetylene (C₂H₂) reacts with ethoxide (CH₃CH₂O^-) in an acid-base reaction?

A) Left
B) Right
C) Neither
D) Cannot be determined

E) A) and B)
F) A) and C)

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Question 23

Multiple Choice

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What is the role of methylchloride (CH₃Cl) in the following reaction?

Which of the following is a Lewis acid but not a Brønsted-Lowry acid?

Which of the following species is the conjugate base of the hydronium ion, H₃O⁺?

Which of the following concepts can be used to explain the difference in acidity between acetylene (C₂H₂) and ethylene (C₂H₄) ?

Rank the following compounds in order of decreasing acidity, putting the most acidic first. $\begin{array} { c c c c } \mathrm { CH } _ { 4 } & \mathrm { NH } _ { 3 } & \text { HF } & \mathrm { H } _ { 2 } \mathrm { O } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}$

Consider the following molecule with protons labeled, I-III. Rank these protons in order of decreasing acidity, putting the most acidic first.

Which of the following compounds is both a Brønsted-Lowry acid and base? $\mathrm { CH } _ { 3 } \mathrm { OH }$        $\mathrm { CH } _ { 3 } \mathrm { COCH } _ { 3 }$        $\mathrm { H } _ { 2 } \mathrm { O }$        $\left( \mathrm { CH } _ { 3 } \right) _ { 3 }\mathrm {~N}$       I                              II              III            IV

What is the nucleophilic site in the following compounds?

Which of the following concepts can be used to explain the difference in acidity between ethanol (CH₃CH₂OH) and 2-fluoroethanol (FCH₂CH₂OH) ?

Which of the following ranks the compounds in order of increasing basicity, putting the least basic first?

Which is the conjugate acid in the following reaction? $\begin{array} { l } \Theta _ { : \mathrm { CH } _ { 3 } } &+&{ \mathrm { H } _ { 2 } O} &?&{\mathrm { CH } _ { 4 } }&\mathrm { HO } ^ { \ominus } \\\text { I } &&\text { II } &&\text { IIII } &\text { IV } \\\end{array}$

Which of the following compounds is the weakest acid?

Identify the Lewis base in the following reaction.

Rank the following compounds in order of decreasing acidity, putting the most acidic first. $\begin{array} { c c c c } \mathrm { CH } _ { 3 } \mathrm { OCH } _ { 3 } & \mathrm { CH } _ { 3 } \mathrm { CHO } & \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OH } & \mathrm { CH } _ { 3 } \mathrm { COOH } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}$

Identify the Lewis acid in the following reaction.

Which of the following statements about a Brønsted-Lowry base is true?

Which of the following species can be both Lewis acid and Lewis base?

Which of the following statements about Lewis bases is true?