Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Coding for branched chains
19 practice questions
Practice questions
1–10 of 19
Question 1
1 mark · Easy
Answer and see the solution →What is the systematic IUPAC name for an alkane with the following skeletal structure?
Skeletal structure: four carbon chain with a methyl group at position 3. Question 2
3 marks · Easy
Answer and see the solution →A hydrocarbon molecule has a side chain attached to its main carbon chain.
(a)[1 mark]State the code for a side chain with the formula .
(b)[1 mark]State the code for a side chain with the formula .
(c)[1 mark]Explain how the codes for methyl and ethyl relate to the number of carbon atoms in the side chain.
Question 3
2 marks · Easy
Answer and see the solution →The structural formula for a hydrocarbon is shown below. The main chain is numbered from left to right.
Diagram: Main chain has five carbon atoms. A methyl group is attached to carbon 2. Give the position of the methyl side chain and write the IUPAC name for this hydrocarbon.
Question 4
2 marks · Easy
Answer and see the solution →A student names the following compound as "2-methylpropane":
Main chain of 3 carbons (numbered 1–3), with methyl groups attached to both carbon 2 and carbon 3. State if this name is correct and explain your answer.
Question 5
3 marks · Easy
Answer and see the solution →The table below shows structures of different side chains found in organic molecules. Study the table and answer the questions.
(a)[2 marks]Side chain structures and codes. Side chain Structure Code A B Complete the 'Code' column for both A and B.
(b)[1 mark]Explain how you identified the codes for the side chains.
Question 6
1 mark · Easy
Answer and see the solution →What is the position of the ethyl side chain in the compound named 3-ethylhexane?
Question 7
3 marks · Easy
Answer and see the solution →Below is the skeletal formula for a hydrocarbon.
(a)[1 mark]Skeletal formula: main chain of four carbons, with methyl groups at carbons 2 and 3. State the length of the longest carbon chain.
(b)[1 mark]Name the type of side chains present.
(c)[1 mark]Give the IUPAC name for the compound.
Question 8
2 marks · Easy
Answer and see the solution →A molecule contains two side chains: one methyl and one ethyl. How many carbon atoms are in the side chains combined?
Question 9
2 marks · Normal
Answer and see the solution →Give the coded names for the following side chains in organic molecules:
(a)[1 mark]A side chain with the formula
(b)[1 mark]A side chain with the formula
Question 10
4 marks · Normal
Answer and see the solution →The compound below has five carbon atoms in its longest chain. It is shown with numbered carbon atoms, and a side chain:
(a)[1 mark]Write the name of the longest chain.
(b)[2 marks]Structural formula of the molecule Identify the type and position of the side chain shown.
(c)[1 mark]Give the full IUPAC name of the compound.