Displayed formulae
4 marks · NormalThe displayed formula of a molecule is shown below:
State the total number of carbon, hydrogen and oxygen atoms present in the molecule.
Identify the functional group present in this molecule.
Describe the connectivity of the oxygen atom in this molecule.
State the types of bonds present between the carbon atoms and the oxygen atom in this displayed formula.
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) 2 carbon atoms, 6 hydrogen atoms, 1 oxygen atom
(b) Alcohol (–OH group); accept hydroxyl group
(c) Oxygen is bonded to one hydrogen atom and one carbon atom.
(d) Single (covalent) bonds
Common mistakes: Incorrect functional group; Confusing number or type of each atom
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correct totals: 2 carbons, 6 hydrogens, 1 oxygen.
B2 (b) · 1 mark · Correct identification of alcohol (–OH group / hydroxyl group).
B3 (c) · 1 mark · Clear description of oxygen connected to one hydrogen and one carbon.
B4 (d) · 1 mark · Single covalent bonds stated for C–O and O–H.
Worked solution
a) There are 2 carbons (C1 and C2), 6 hydrogens (attached to C1, C2, and O1), and 1 oxygen.
b) The molecule contains an alcohol functional group (–OH group).
c) The oxygen atom (O1) is bonded to H5 and C2.
d) Both the C–O and O–H connections are single covalent bonds.