Esters
5 marks · EasyEthyl propanoate is an ester formed in organic chemistry reactions.
Write the names of the alcohol and the carboxylic acid used to make ethyl propanoate.
State one typical use for esters such as ethyl propanoate.
Draw the structural formula for ethyl propanoate.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) Alcohol: ethanol; Carboxylic acid: propanoic acid
(b) Used as a flavouring or perfume
(c) Structural formula of ethyl propanoate: CH3CH2COOCH2CH3, fully displayed with all bonds and atoms · must show all atoms and bonds, correct ester link
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Marking points
B1 (a) · 1 mark · Identifies ethanol as the alcohol
B2 (a) · 1 mark · Identifies propanoic acid as the acid
B3 (b) · 1 mark · States a typical use of esters (e.g. flavouring/perfume)
B4 (c) · 1 mark · Draws correct backbone for ethyl propanoate
B5 (c) · 1 mark · Shows all atoms and bonds correctly
Worked solution
(a) The alcohol is ethanol, and the carboxylic acid is propanoic acid.
(b) Esters such as ethyl propanoate are commonly used as flavourings or perfumes.
(c) The structural formula for ethyl propanoate is:
Drawn with all atoms and bonds.