May/June 2026 Paper 42

2026 · 6 questions · 45 parts · 80 marks

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6(a)Organic Nomenclature FormulaeHard1 mark

Alcohols are a homologous series of organic compounds. Table 6.1 gives some information about alcohols A, B, C and D.

Table 6.1

alcohol	A	B	C	D
number of carbon atoms	1	2	3	3
name	methanol	ethanol
structural formula	CH $_{3}$ OH	CH $_{3}$ CH $_{2}$ OH	CH $_{3}$ CH $_{2}$ CH $_{2}$ OH	CH $_{3}$ CH(OH)CH $_{3}$

State why the homologous series of alcohols have similar chemical properties.

6(b)(i)Atomic Structure IsotopesEasy1 mark

Use information from Table 6.1 to answer the following questions. Deduce the number of electrons in a molecule of A.

Answer

6(b)(ii)Organic Nomenclature FormulaeEasy1 mark

State the molecular formula of B.

6(b)(iii)Organic Nomenclature FormulaeEasy1 mark

Name C.

6(b)(iv)Organic Nomenclature FormulaeEasy1 mark

Name D.

6(c)Structural Geometric IsomerismEasy1 mark

The structural formula of B, CH

_{3}

_{2}

OH, can also be written as C

_{2}

_{5}

OH. Explain why the structural formula C

_{3}

_{7}

OH does not identify C.

Answer

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6(d)AlcoholsEasy2 marks

Ethanol is a fuel. Write the symbol equation for the complete combustion of ethanol.

Answer

0 words

6(e)(i)AlcoholsEasy1 mark

Ethanol can be oxidised by two methods. method 1 Heating ethanol with an acidified aqueous oxidising agent. method 2 The oxidation of ethanol using bacteria. Name the acidified aqueous oxidising agent used in method 1.

6(e)(ii)AlcoholsEasy1 mark

Give the chemical name of the organic product in method 1.

6(e)(iii)AlcoholsEasy1 mark

Name the food product in method 2.

6(f)(i)Carboxylic Acids EstersEasy2 marks

Alcohol D reacts with ethanoic acid in the presence of a catalyst to form ester X and one other product. Draw the displayed formula of ester X.

Draw with the mouse or a finger.

6(f)(ii)Carboxylic Acids EstersEasy1 mark

Name the other product formed.