Drawing and naming the alcohols
4 marks · NormalName each alcohol below using IUPAC conventions.
An alcohol with the molecular formula C2H6O and the structural formula CH3CH2OH.
An alcohol with the molecular formula C3H8O where the -OH group is attached to the second carbon atom.
An alcohol with four carbon atoms and the -OH group attached to the first carbon atom.
State another acceptable name that could be used for butan-1-ol in an exam.
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) ethanol
(b) propan-2-ol · must show Must include position 2 for –OH
(c) butan-1-ol · must show Must include position 1 for –OH
(d) butanol · must show Accept 'butanol' as alternative
Common mistakes: Missing position number for -OH group; Incorrect number of carbons
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correctly names ethanol
B1 (b) · 1 mark · Correctly names propan-2-ol (must state position 2)
B1 (c) · 1 mark · Correctly names butan-1-ol (must state position 1)
B1 (d) · 1 mark · States 'butanol' as an acceptable alternative name
Worked solution
a) Ethanol.
b) Propan-2-ol.
c) Butan-1-ol.
d) Butanol.