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Chem - Chapter 26 > 26.4-Carboxylic acids derivatives > Flashcards

26.4-Carboxylic acids derivatives Flashcards

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1
Q

What is meant by derivative of carboxylic acid ?

A

compound that can be hydrolysed to form parent carboxylic acid

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2
Q

Give examples of carboxylic acid derivatives

A

esters
amides
anhydrides
acyl chloride

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3
Q

What do all carboxylic acid derivatives contain ?

A

acyl groups

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4
Q

What are acyl groups ?

A

common sequence of atoms in their structure

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5
Q

How are acid anhydrides formed ?

A

removal of water from two carboxylic acid molecules

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6
Q

What is esterification ?

A

reaction of carboxylic acid and alcohol to form an ester

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7
Q

What is used as a catalyst in esterification ?

A

sulphuric acid

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8
Q

What is formed when carboxylic acid and alcohol react ?

A

ester

water

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9
Q

What can esters be hydrolysed by ?

A

acid

alkali

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10
Q

What happens when esters are hydrolysed ?

A

hydrolysis takes place

breakdown of compound in presence of water

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11
Q

What happens to the ester in acid hydrolysis ?

A

heated under reflux with dilute aqueous acid

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12
Q

What is formed when ester undergoes acid hydrolysis?

A

carboxylic acid and alcohol formed

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13
Q

Is acid hydrolysis reversible or irreversible ?

A

reversible

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14
Q

What does the dilute aqueous acid act as in acid hydrolysis ?

A

acts as a catalysts

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15
Q

What does breaks down ester in acid hydrolysis ?

A

water

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16
Q

What happens to the ester in alkaline hydrolysis ?

A

heated under reflux with aqueous hydroxide ions

17
Q

Is alkaline hydrolysis reversible or irreversible ?

A

irreversible

18
Q

What is formed when ester reacts withs OH ions in alkaline hydrolysis ?

A

carboxylate ion

alcohol

19
Q

How are acyl chlorides formed ?

A

parent carboxylic acid reacts with thionyl chloride (SOCl2)

20
Q

What is formed when carboxlic acid reacts with SOCl2 ?

A

acyl chloride , so2 , hcl

Chem - Chapter 26 (4 decks)

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