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WorksheetsOrganic Chemsitry: Carboxylic Acids and Esters
Total questions: 10
Worksheet time: 6mins
What are the physical properties of carboxylic acids? check the correct answer/s.
Carboxylic acids are polar compounds that associate by hydrogen bonding into dimers in the liquid and solid states.
Carboxylic acids possess both a region of polarity and a region of nonpolarity.
The first four aliphatic carboxylic acids are infinitely soluble in water because the hydrophilic carboxyl group more than counterbalances the hydrophobic hydrocarbon chain.
Carboxylic acids have lower boiling points and are more insoluble in water than alcohols, aldehydes, ketones, and ethers of comparable molecular weight.
As the size of the carbon chain increases, the hydrophobic group becomes dominant, and solubility in water decreases.
Choose the correct statement/s.
A carboxyl group is reduced to a 1° alcohol by LiAlH4.
A carboxyl group is reduced to a 1° alcohol by H2/Pt.
A carboxyl group is reduced to a 1° alcohol by NaBH4.
All are correct answers.
None of correct answers.
Which acid in this set is the stronger? Lactic acid (pKa 3.85) or propanoic acid (pKa 4.87).
Lactic acid
Propanoic acid.
Esters are virtually insoluble in water. What is the order of solubility in water of the following compounds?
1) ethyl methanoate
2) ethyl butanoate
3) ethyl ethanoate
1 > 2 > 3
1 > 3 > 2
3 > 1 > 2
2 > 3 > 1
3 > 2 > 1
How do esters react with Grignard reagents?
results in a carboxylic acid.
results amides.
results water-soluble salts with alkali metal hydroxides, carbonates, and bicarbonates, as well as with ammonia and amines.
results an alcohol containing the two identical alkyl groups.
results a 1° alcohol.
Answer true or false to the following statement. Fischer esterification involves the reaction of a carboxylic acid with another carboxylic acid.
True.
False.
Answer true or false to the following statement. Both alcohols and carboxylic acids react with SOCl2.
True.
False.
Answer true or false to the following statement. Carboxylic acids are less acidic than phenols.
True.
False.
Choose the correct statement/s about ester reaction.
Esters react with water without the need for acid or base.
Esters react with ammonia and amines without the need
for acid or base.
An ester can be converted to an acid halide in one step.
Esters react with alcohols without the need for acid or
base.
An ester reacts with Grignard reagents to form a 3° alcohol.
What is the result of this reacion?
Methyl butanoate.
Butyl ethanoate.
Methyl ethanoate.
Butyl butanoate.
Propyl ethanoate.
