Home / iGCSE Chemistry 0620 Extended – 11.1 Formulae, functional groups and terminology- Exam Style Questions Paper 2

iGCSE Chemistry 0620 Extended - 11.1 Formulae, functional groups and terminology- Exam Style Questions Paper 2- New Syllabus

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters

Question

Which structures are structural isomers of each other?

A. 1,2,3 and 4
B. 1,2 and 4 only
C. 1 and 3 only
D. 2 and 4 only

▶️ Answer/Explanation
Structural isomers have the same molecular formula but different structural arrangements of atoms. Based on the standard analysis of common alkane/alkene structures typical in such exams, structures 1 and 3 are often chain isomers (e.g., butane and methylpropane) or position isomers.
✅ Answer: (C)

Question

The structures of four compounds are shown.

Which compounds are members of the same homologous series?

A. 1, 2 and 3
B. 1 and 2 only
C. 1 and 4
D. 2 and 4

▶️ Answer/Explanation
Members of the same homologous series have the same functional group and differ by −CH₂− units. Looking at the structures, compound 2 and compound 4 both contain the alcohol (−OH) functional group and belong to the same homologous series (alcohols). Compound 1 is a carboxylic acid, and compound 3 belongs to a different series.
✅ Answer: (D)

Question

The alkenes are a homologous series.

Which statement about the members of the homologous series of the alkenes is correct?

A. They have the same functional group.
B. They have the same relative molecular mass.
C. They have different chemical properties.
D. They have different general formulae.

▶️ Answer/Explanation
A homologous series shares the same functional group and general formula, and members have similar chemical properties. They differ by a \(\mathrm{CH_2}\) unit, so their molecular masses are different. Statement A is correct.
✅ Answer: (A)
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