Drawing and naming esters
5 marks · HardA reaction mixture contains ethanol and benzoic acid. Heat is applied, together with a few drops of concentrated sulfuric acid as a catalyst.
State the type of reaction taking place.
Write the name of the ester that would be formed.
Draw the full structural formula for the ester formed.
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.
Show answer
(a) esterification
(b) ethyl benzoate
(c) — · must show O=C-O- linkage, benzene ring connected to C=O, ethyl group connected to O, all H and C atoms shown, no missing bonds
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States the correct reaction type as 'esterification'.
B2 (b) · 1 mark · Names the ester as 'ethyl benzoate'.
M1 (c) · 1 mark · Draws full structure of ester with correct ester linkage (O=C-O-).
M2 (c) · 1 mark · Shows benzene ring attached to carbonyl C and ethyl group attached to O.
A1 (c) · 1 mark · All bonds, hydrogens and groups drawn correctly with no missing atoms.
Worked solution
(a) The reaction is called esterification.
(b) The ester formed from ethanol and benzoic acid is ethyl benzoate.
(c) Draw the full structural formula for ethyl benzoate:
The structure is:
Show: benzene ring—C(=O)—O—CH2CH3 with all hydrogens shown, bonds complete.