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Carboxylic acids, esters and derivatives

Last updated about 1 year ago
28 questions
Note from the author:
https://sites.google.com/u/0/d/1CX2vlsL-raIH2EqmQ7HRYqi5gYyllAvg/p/1aStEngryhaVQ1aGCGXd0dFpeMZmxaGKp/preview?authuser=0
https://sites.google.com/u/0/d/1CX2vlsL-raIH2EqmQ7HRYqi5gYyllAvg/p/1aStEngryhaVQ1aGCGXd0dFpeMZmxaGKp/preview?authuser=0
1

Which compound has the highest boiling temperature?

1

Which reaction does not produce a carboxylic acid?

1

The organic product of the reaction of ethanoyl chloride with ammonia gas is:

1

Which compound gives a pale yellow precipitate on warming with a solution of iodine and sodium hydroxide?

1

Lithium tetrahydridoaluminate(III), LiAlH₄, is used to reduce the compound shown. The product formed is:


1

Carboxylic acids and acyl chlorides both react with alcohols to produce esters.

Acyl chlorides are often preferred to carboxylic acids for this reaction because the yield of the ester is usually higher.

Which of the following statements is the best explanation for the higher yield?

1

Polyesters can be made by the reaction of:

1

When mixed in equimolar quantities, which pair of molecules will not rotate the plane of plane-polarised light?

1

In gas chromatography (GC), which one of the following would increase the retention time for an alcohol?

1

Which compound is both completely miscible in water and has a higher boiling temperature than water?

1

Which compound forms a precipitate with Fehling's or Benedict’s solutions and with iodine in the presence of alkali?

1

Which reaction does not produce a tertiary alcohol as one of the products?

1

Which change decreases the retention time in gas chromatography?

1

Draw the structure of the cyclic ester B.

1

Draw the structure of the condensation polymer C, showing two repeat units.

1
(i) Give the molecular formula of the triester.

C_______ H_______ O_______
3

(ii) Complete the equation for the alkaline hydrolysis of this triester with excess aqueous sodium hydroxide, showing the structures of the products.

1

Identify Reagent P, by name or formula.

1


Identify reagent Q

1


Identify reagent S

1

1

1

1

1

1

1

1
Use this to make a model answer.
Any one ______________ : 
no heat required / works at room temperature so reduces energy cost
or  no catalyst required reducing product purification costs / making purification easier / so no need to recover catalyst
or  reaction is not an equilibrium / reaction goes to completion so produces a higher yield Any one disadvantage:
hydrogen chloride produced is acidic / corrosive so corrosion resistant plant/equipment required (which is more expensive)

or  HCl is toxic so must use a fume cupboard / clean exhaust gases / capture the gas (for sale)
Other Answer Choices:
advantage