Coding for the type of compound
4 marks · NormalDefine organic chemistry.
Give the general formula for alkanes.
State the characteristic feature that distinguishes alkenes from alkanes.
Name the class of compounds with only carbon and hydrogen atoms joined by single covalent bonds.
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(a) The study of carbon compounds (excluding a few simple ones like carbon dioxide)
(b) CnH2n+2
(c) Alkenes have a carbon–carbon double bond; alkanes have only single bonds
(d) alkane(s)
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Marking points
B1 (a) · 1 mark · Defines organic chemistry as the study of carbon compounds
B2 (b) · 1 mark · Gives correct general formula for alkanes (CnH2n+2)
B3 (c) · 1 mark · States that alkenes have a C=C double bond, alkanes do not
B4 (d) · 1 mark · Names the class as alkanes
Worked solution
a) Organic chemistry is the study of carbon compounds (except some simple ones like CO2 and carbonates).
b) The general formula for alkanes is CnH2n+2.
c) Alkenes have a C=C double bond; alkanes have only single C–C bonds.
d) These compounds are called alkanes.