Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
41–50 of 317 · Easy
Question 41
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 42
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 43
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 44
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 45
1 mark · Easy
Answer and see the solution →What is the position of the ethyl side chain in the compound named 3-ethylhexane?
Question 46
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 47
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 48
1 mark · Easy
Answer and see the solution →State what structural isomers have in common.
Question 49
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the difference between a straight-chain alkane and a branched-chain alkane.
(b)[2 marks]Draw the displayed formula for a branched structural isomer of C5H12.
Question 50
2 marks · Easy
Answer and see the solution →Propane (C3H8) has no structural isomers. Predict and state the number of structural isomers for butane (C4H10).