Question 1

What salt results from the reaction of benzoic acid with potassium hydroxide?

Accepted Answer

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Question 2

Which of the following statements is$\underline{\text{ true?  }}$

Accepted Answer

At two pH units above the pKa, the carboxylate ion concentration is 100 times greater than the carboxylic acid concentration, according to the Henderson-Hasselbalch equation.

Question 3

Which of the following compounds is the strongest acid?

Accepted Answer

The presence of nitro group introduces additional electron-withdrawing effect to the carboxylic acid functional group, increasing the acidity of the compound.

Question 4

At pH 4.5, which of the following acids would be most dissociated?

Accepted Answer

p-nitrobenzoic acid has the lowest pK_a value, indicating that it is the strongest acid and will be most dissociated at pH 4.5.

Question 5

The strongest dichlorobutanoic acid is:

Accepted Answer

2,2-dichlorobutanoic acid is the strongest acid among the options because the electron-withdrawing inductive effect of the chlorine atoms is strongest when they are closest to the carboxylic acid group, enhancing the acid's ability to donate a proton.

Question 6

Provide the major organic product of the reaction shown below.

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Question 7

Which of the following sequences ranks the structures below in order of increasing acidity?

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Question 8

Name the salt formed from the reaction of acetic acid with ammonia.

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Question 9

An unknown compound is insoluble in water but dissolves in sodium bicarbonate with a release of carbon dioxide bubbles. The compound is almost certainly:

Accepted Answer

The fact that the compound dissolves in sodium bicarbonate with a release of bubbles indicates that it is an acid. Additionally, the fact that it is insoluble in water suggests that it is likely a carboxylic acid, which are often insoluble in water but soluble in basic solutions.

Question 10

Which of the following is the strongest acid?

Accepted Answer

The presence of the electron-withdrawing nitro group (NO2) in E increases the acidity by stabilizing the negative charge on the conjugate base through resonance and inductive effects.

Question 11

What products result from the reaction of sodium propanoate with hydrobromic acid?

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Question 12

An ether solution of PhCO₂H (A), PhNH₂ (B), and PhCH₃ (C) is extracted with aqueous NaOH. The ether layer will contain what compound(s) after the extraction?

Accepted Answer

When the ether solution is extracted with aqueous NaOH, compound A (PhCO₂H) will be converted to PhCO- and compound C (PhCH₃) will be converted to PhCH- in the aqueous layer. Only compound B (PhNH₂) will remain in the ether layer. Therefore, the ether layer will contain compound B and not compounds A or C.

Question 13

Which of the following is the strongest acid?

Accepted Answer

The strength of an acid is dependent on the number of dissociable protons (H+) it has. Trichloroacetic acid (C) has three dissociable protons, while dichloroacetic acid (B) has two, chloroacetic acid (A) has one, and acetic acid (D) has only a very weak acidic property with a single H+ dissociation. Therefore, trichloroacetic acid (C) is the strongest acid among the options given.

Question 14

List the following weak acids in order of increasing acidity (from lowest to highest.).

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Question 15

After completing the synthesis of 3-methylpentanoic acid, which of the following treatments will neutralize the mineral acids and facilitate the distribution of the organic acid from the organic layer to the aqueous extraction layer?

Accepted Answer

Extraction with aqueous NaHCO3 (sodium bicarbonate) neutralizes the mineral acids present and converts the organic acid (3-methylpentanoic acid) into its sodium salt, which is more soluble in the aqueous layer, facilitating its transfer from the organic layer to the aqueous extraction layer.

Question 16

In the propanoate ion,

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...

Question 17

Provide the structure of zinc undecanoate, a major component in several athlete's foot medications.

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Question 18

Why are the OH groups of carboxylic acids more acidic than alcohols?

Accepted Answer

The carboxylate ion formed upon deprotonation of a carboxylic acid can be stabilized by resonance, which disperses the negative charge over two oxygen atoms. This resonance effect makes it easier to remove the acidic proton and therefore makes carboxylic acids more acidic than alcohols.

Question 19

Which of the following is the strongest acid?

Accepted Answer

The strength of an acid is determined by its ability to donate a hydrogen ion (H+). In this case, the presence of fluorine (F) atoms in fluoroacetic acid (D) makes it the strongest acid because the electronegativity of fluorine attracts electron density away from the hydrogen atom, making it easier to donate the H+ ion. Therefore, D is the strongest acid among the given options.

Question 20

Using acid-base extractions, how might you purify a crude sample of benzoic acid?

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Quiz 20: Carboxylic Acids

What salt results from the reaction of benzoic acid with potassium hydroxide?

Which of the following statements is $\underline{\text{ true? }}$

Which of the following compounds is the strongest acid?

At pH 4.5, which of the following acids would be most dissociated?

The strongest dichlorobutanoic acid is:

Provide the major organic product of the reaction shown below.

Which of the following sequences ranks the structures below in order of increasing acidity?

Name the salt formed from the reaction of acetic acid with ammonia.

An unknown compound is insoluble in water but dissolves in sodium bicarbonate with a release of carbon dioxide bubbles. The compound is almost certainly:

Which of the following is the strongest acid?

What products result from the reaction of sodium propanoate with hydrobromic acid?

An ether solution of PhCO₂H (A) , PhNH₂ (B) , and PhCH₃ (C) is extracted with aqueous NaOH. The ether layer will contain what compound(s) after the extraction?

Which of the following is the strongest acid?

List the following weak acids in order of increasing acidity (from lowest to highest.) .

After completing the synthesis of 3-methylpentanoic acid, which of the following treatments will neutralize the mineral acids and facilitate the distribution of the organic acid from the organic layer to the aqueous extraction layer?

In the propanoate ion,

Provide the structure of zinc undecanoate, a major component in several athlete's foot medications.

Why are the OH groups of carboxylic acids more acidic than alcohols?

Which of the following is the strongest acid?

Using acid-base extractions, how might you purify a crude sample of benzoic acid?

Quiz 20: Carboxylic Acids

What salt results from the reaction of benzoic acid with potassium hydroxide?

Which of the following statements is true? ‾\underline{\text{ true? }} true? ​

Which of the following compounds is the strongest acid?

At pH 4.5, which of the following acids would be most dissociated?

The strongest dichlorobutanoic acid is:

Provide the major organic product of the reaction shown below.

Which of the following sequences ranks the structures below in order of increasing acidity?

Name the salt formed from the reaction of acetic acid with ammonia.

An unknown compound is insoluble in water but dissolves in sodium bicarbonate with a release of carbon dioxide bubbles. The compound is almost certainly:

Which of the following is the strongest acid?

What products result from the reaction of sodium propanoate with hydrobromic acid?

An ether solution of PhCO2H (A) , PhNH2 (B) , and PhCH3 (C) is extracted with aqueous NaOH. The ether layer will contain what compound(s) after the extraction?

Which of the following is the strongest acid?

List the following weak acids in order of increasing acidity (from lowest to highest.) .

After completing the synthesis of 3-methylpentanoic acid, which of the following treatments will neutralize the mineral acids and facilitate the distribution of the organic acid from the organic layer to the aqueous extraction layer?

In the propanoate ion,

Provide the structure of zinc undecanoate, a major component in several athlete's foot medications.

Why are the OH groups of carboxylic acids more acidic than alcohols?

Which of the following is the strongest acid?

Using acid-base extractions, how might you purify a crude sample of benzoic acid?

Which of the following statements is $\underline{\text{ true? }}$

An ether solution of PhCO₂H (A) , PhNH₂ (B) , and PhCH₃ (C) is extracted with aqueous NaOH. The ether layer will contain what compound(s) after the extraction?