An ester is an organic compound containing a -COOR functional group. Esters have characteristic smells and are used in perfumes, cosmetics and as solvents.

What are two advantages of preparing esters using acyl chlorides rather than carboxylic acids?

Acyl chlorides are more reactive so the ester forms faster, and the reaction goes to completion so there is no equilibrium mixture and the maximum yield of ester is obtained.

True or False? The esterification of alcohols with carboxylic acids goes to completion, giving maximum yield.

False. The esterification of alcohols with carboxylic acids is reversible and reaches an equilibrium, so the yield of ester is not maximised. Using acyl chlorides instead gives a complete reaction.

Ethyl ethanoate is formed from .......... and ethanoyl chloride. Phenyl benzoate is formed from phenol and .......... chloride.

Ethyl ethanoate is formed from ethanol and ethanoyl chloride. Phenyl benzoate is formed from phenol and benzoyl chloride.

What type of reaction occurs when an alcohol reacts with an acyl chloride to form an ester?

A condensation reaction (also described as an addition-elimination reaction). The alcohol adds across the C=O bond and HCl is eliminated.

True or False? The first part of an ester's name comes from the alcohol used and the second part comes from the acyl chloride.

True. For example, ethanol + ethanoyl chloride gives ethyl ethanoate: "ethyl" from ethanol and "ethanoate" from ethanoyl chloride.

In the esterification of an acyl chloride, the .......... or phenol adds across the C=O bond and .......... is eliminated.

In the esterification of an acyl chloride, the alcohol or phenol adds across the C=O bond and HCl is eliminated.

Define esterification .

Esterification is a condensation reaction in which an alcohol (or phenol) reacts with a carboxylic acid or acyl chloride to form an ester and a small molecule (water or HCl).

A LevelChemistryCambridge (CIE)Flashcards33. Carboxylic Acids & DerivativesEsters

Esters (Cambridge (CIE) A Level Chemistry): Flashcards

Exam code: 9701

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Define ester.

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Cards in this collection (9)

Define ester.
An ester is an organic compound containing a -COOR functional group. Esters have characteristic smells and are used in perfumes, cosmetics and as solvents.
What are two advantages of preparing esters using acyl chlorides rather than carboxylic acids?
Acyl chlorides are more reactive so the ester forms faster, and the reaction goes to completion so there is no equilibrium mixture and the maximum yield of ester is obtained.
True or False?
The esterification of alcohols with carboxylic acids goes to completion, giving maximum yield.
False.
The esterification of alcohols with carboxylic acids is reversible and reaches an equilibrium, so the yield of ester is not maximised. Using acyl chlorides instead gives a complete reaction.
Ethyl ethanoate is formed from .......... and ethanoyl chloride. Phenyl benzoate is formed from phenol and .......... chloride.
Ethyl ethanoate is formed from ethanol and ethanoyl chloride. Phenyl benzoate is formed from phenol and benzoyl chloride.
What type of reaction occurs when an alcohol reacts with an acyl chloride to form an ester?
A condensation reaction (also described as an addition-elimination reaction). The alcohol adds across the C=O bond and HCl is eliminated.
True or False?
The first part of an ester's name comes from the alcohol used and the second part comes from the acyl chloride.
True.
For example, ethanol + ethanoyl chloride gives ethyl ethanoate: "ethyl" from ethanol and "ethanoate" from ethanoyl chloride.
What ester is formed from the reaction of phenol with benzoyl chloride?
Phenyl benzoate is formed.
In the esterification of an acyl chloride, the .......... or phenol adds across the C=O bond and .......... is eliminated.
In the esterification of an acyl chloride, the alcohol or phenol adds across the C=O bond and HCl is eliminated.
Define esterification.
Esterification is a condensation reaction in which an alcohol (or phenol) reacts with a carboxylic acid or acyl chloride to form an ester and a small molecule (water or HCl).

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