MCAT carboxylic acid derivative reactivity practice questions
Practice questions focused on the reactivity of carboxylic acid derivatives for MCAT preparation, covering key concepts and mechanisms.
Quiz(48 questions)
1. Which of the following isNOT a carboxylic acid derivative?
Terms in this Study Set(48)
Reactivity Overview(16)
What are the main types of carboxylic acid derivatives?
Esters, amides, anhydrides, acyl chlorides.
True or False: Acyl chlorides are more reactive than esters.
True. Acyl chlorides are highly reactive due to the presence of a good leaving group.
Fill in the blank: The reactivity of carboxylic acid derivatives decreases in the order of _____ to _____ to _____ to _____.
acyl chlorides, anhydrides, esters, amides.
Cause → Effect: A good leaving group leads to _____ reactivity.
increased reactivity in nucleophilic acyl substitution.
Which derivative is least reactive?
Amides are the least reactive due to resonance stabilization.
What is the primary factor affecting nucleophilic attack in carboxylic acid derivatives?
The electrophilicity of the carbonyl carbon.
Compare reactivity: Anhydrides vs. Esters.
Anhydrides are more reactive than esters due to less steric hindrance and a better leaving group.
What kind of reaction do carboxylic acid derivatives undergo?
Nucleophilic acyl substitution reactions.
Fill in the blank: Carboxylic acid derivatives can undergo _____ with nucleophiles.
nucleophilic acyl substitution.
True or False: Amides can be converted to carboxylic acids easily.
False. Amides are stable and require strong conditions for hydrolysis.
How does sterics affect reactivity among carboxylic acid derivatives?
Bulky groups decrease reactivity by hindering nucleophilic attack.
What is a common use of acyl chlorides in the lab?
Synthesis of esters and amides due to their high reactivity.
Cause → Effect: The presence of electron-withdrawing groups leads to _____ reactivity.
increased reactivity in nucleophilic acyl substitution.
What role do leaving groups play in carboxylic acid derivative reactions?
Good leaving groups facilitate nucleophilic attack, increasing reaction rates.
What kind of nucleophile would react fastest with an acyl chloride?
A strong nucleophile like a Grignard reagent.
Fill in the blank: The reactivity of carboxylic acid derivatives correlates with the _____ of the leaving group.
stability.
Nucleophilic Acyl Substitution(16)
Nucleophilic acyl substitution involves which two components?
A nucleophile and an acyl compound.
Reaction of ester with a strong nucleophile yields what?
A carboxylic acid and an alcohol.
True or False: Nucleophilic acyl substitution is irreversible.
False. It can be reversible depending on reaction conditions.
Identify the nucleophile in this reaction: RCOCl + Nu → ?
RCONu + Cl- (where Nu is the nucleophile).
Fill in the blank: Acyl chlorides are more reactive than __________.
Esters and amides.
What does the leaving group in nucleophilic acyl substitution determine?
The reactivity of the acyl derivative.
Ester + water + acid catalyst → ?
Carboxylic acid and alcohol (hydrolysis).
Compare acyl chlorides and amides in reactivity.
Acyl chlorides are more reactive than amides due to better leaving group ability.
Mechanism step: What happens after the nucleophile attacks the carbonyl carbon?
Formation of a tetrahedral intermediate.
Which solvent increases the rate of nucleophilic acyl substitution?
Polar aprotic solvents (e.g., DMSO).
True or False: Nucleophiles can only be negatively charged.
False. Nucleophiles can also be neutral.
In nucleophilic acyl substitution, what does the acyl part provide?
A carbonyl carbon that is electrophilic.
Hydroxylamine reacts with a carboxylic acid derivative to form what?
An oxime (nucleophilic acyl substitution).
What is the role of the leaving group in nucleophilic acyl substitution?
Facilitates the substitution by departing and stabilizing the intermediate.
Ester + Grignard reagent yields what product?
Tertiary alcohol after nucleophilic acyl substitution.
Order the reactivity of carboxylic acid derivatives from most to least reactive.
Acyl chlorides > Anhydrides > Esters > Amides.
Functional Group Transformations(16)
Carboxylic acid → Acid chloride
Using SOCl₂ (thionyl chloride) or PCl₅. Results in: - Increased reactivity. - Useful in synthesis.
True or False: Esters can be converted to amides.
True. Esters can react with ammonia (NH₃) or amines to produce amides.
Reactants needed for ester to acid chloride conversion?
SOCl₂ or PCl₅ are commonly used reagents.
Fill in the blank: Amides can be converted to _____ by treatment with strong acids.
Carboxylic acids. Strong acids facilitate hydrolysis.
Which is more reactive: acid anhydride or ester?
Acid anhydride. - More electrophilic carbon. - More reactive in nucleophilic acyl substitution.
Convert an acid chloride to a carboxylic acid.
Add water (H₂O). This reaction is hydrolysis, producing a carboxylic acid.
True or False: Alcohols can directly convert to acid chlorides.
False. Alcohols must first be oxidized to carboxylic acids before conversion.
What reagent converts an ester to a carboxylic acid?
Use a strong acid, like H₂SO₄, under hydrolysis conditions.
Acid chloride → Amide
React with ammonia (NH₃) or an amine. Results in: - Amide formation. - Release of HCl.
Fill in the blank: Acid anhydrides can be converted to _____ by alcohol addition.
Esters. This reaction is nucleophilic acyl substitution.
Ester → Acid chloride: Which reagent?
Use SOCl₂. This converts the ester to a more reactive acid chloride.
True or False: Anhydrides are less reactive than acid chlorides.
False. Anhydrides are more reactive than esters, but less than acid chlorides.
Amide → Acid: What is the process?
Hydrolysis with strong acids (e.g., HCl) or bases (e.g., NaOH) yields carboxylic acids.
Compare reactivity of esters vs. acid anhydrides.
Esters are less reactive than acid anhydrides due to steric hindrance.
Complete the transformation: Acid anhydride + _____ → Ester.
Alcohol. This reaction produces an ester and a carboxylic acid.
Carboxylic acid → Ester: What reaction type?
Fischer esterification. Combine with alcohol in the presence of an acid catalyst.
Questions in this Study Set(48)
1. Which of the following isNOT a carboxylic acid derivative?
2. Which of the following statements about nucleophilic acyl substitution is true?
3. Which reagent is commonly used to convert a carboxylic acid to an acid chloride?
4. What is the main reason acyl chlorides are more reactive than esters?
5. In the reaction of an ester with a strong nucleophile, what is the primary product?
6. What is a product formed when an ester is treated with a strong acid under hydrolysis conditions?
7. Which carboxylic acid derivative is most likely to undergo nucleophilic acyl substitution?
8. True or False: The nucleophile in nucleophilic acyl substitution can only be negatively charged.
9. True or False: Acid chlorides can be converted directly to carboxylic acids without any additional reagents.
10. Fill in the blank: The reactivity of carboxylic acid derivatives decreases in the order of _____ to _____ to _____ to _____
11. In the reaction RCOCl + Nu → ?, what is the product if Nu is an alcohol?
12. Which functional group transformation is NOT possible?
13. In which reaction do carboxylic acid derivatives participate primarily?
14. Fill in the blank: Acyl chlorides are more reactive than __________.
15. Which of the following is a more reactive species in nucleophilic acyl substitution?
16. True or False: Anhydrides are less reactive than amides.
17. What effect does the leaving group have on the reactivity of acyl derivatives?
18. Fill in the blank: Acid anhydrides can be converted to _____ by adding an alcohol.
19. What effect does increasing steric bulk around a carbonyl carbon have on reactivity?
20. What is the result of hydrolyzing an ester in the presence of water and an acid catalyst?
21. What is the first step in converting an acid chloride to an amide?
22. Which nucleophile would be expected to react with an acyl chloride most rapidly?
23. Compare the reactivity of acyl chlorides and amides in nucleophilic acyl substitution.
24. Which of the following statements is TRUE regarding amides?
25. Fill in the blank: The stability of the leaving group is critical for the _____ of a nucleophilic acyl substitution reaction.
26. What happens immediately after the nucleophile attacks the carbonyl carbon in nucleophilic acyl substitution?
27. What reagent can be used to convert an ester back to a carboxylic acid?
28. Which of the following increases the electrophilicity of a carbonyl carbon in a carboxylic acid derivative?
29. Which solvent is known to increase the rate of nucleophilic acyl substitution?
30. Which functional group is less reactive: ester or acid anhydride?
31. Which carboxylic acid derivative is the least reactive?
32. True or False: Nucleophilic acyl substitution can occur without a leaving group.
33. Which transformation is likely to require a strong acid as a catalyst?
34. What type of reaction do esters typically undergo when treated with a strong nucleophile?
35. What does the acyl part of the molecule provide in nucleophilic acyl substitution?
36. What type of reaction occurs when an acid chloride reacts with an alcohol?
37. Cause → Effect: The presence of a good leaving group in a carboxylic acid derivative leads to _____ reactivity.
38. What product is formed when hydroxylamine reacts with a carboxylic acid derivative?
39. True or False: Alcohols can be converted directly to acid chlorides.
40. True or False: Carboxylic acid derivatives can be interconverted through nucleophilic acyl substitution.
41. In nucleophilic acyl substitution, what role does the leaving group play?
42. What is the driving force behind the conversion of an acid anhydride to an ester?
43. Which of the following carboxylic acid derivatives is most likely to hydrolyze in water?
44. What is the product when an ester reacts with a Grignard reagent?
45. What happens when an acid chloride is treated with water?
46. Which of the following statements about carboxylic acid derivatives is true?
47. Order the reactivity of the following carboxylic acid derivatives from most to least reactive: Acyl chlorides, Amides, Esters.
48. Which of the following reagents is necessary to convert an acid chloride to an amide?
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