Coding for the type of compound
3 marks · EasyThe table shows the names and formulas of some organic compounds.
| Name | Formula |
|---|---|
| methane | CH4 |
| ethene | C2H4 |
| propane | C3H8 |
| butene | C4H8 |
Which compound in the table contains a carbon–carbon double bond?
State the code letters that indicate a three-carbon chain in an organic compound.
Give the homologous series to which 'butene' belongs.
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) ethene
(b) prop
(c) alkenes
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Identifies 'ethene' as the compound with a C=C double bond.
B1 (b) · 1 mark · States 'prop' as code letters for three carbons.
B1 (c) · 1 mark · Gives 'alkenes' as the homologous series for butene.
Worked solution
a) The compound with a double bond is 'ethene' (formula C2H4).
b) The code letters for a three-carbon chain are 'prop'.
c) 'Butene' belongs to the alkene homologous series as the name ends with 'ene' and its formula fits CnH2n.