CIE iGCSE Co-Ordinated Science C11.1 Formulas and terminology Exam Style Questions Paper 1
Question
The structure of a molecule of an organic compound is shown.
What is the formula of this compound?
(A) C4H4O3 (B) C4H4O3 (C) C4H6O3 (D) 4C6H3O
▶Answer/Explanation
Ans : C
Question
Methane is a covalent compound. Which statement about methane is correct?
A. It conducts electricity.
B. It is a gas at room temperature.
C. It is an unsaturated hydrocarbon.
D. It is formed from a metal and a non-metal.
▶️Answer/Explanation
Answer: B. It is a gas at room temperature.
Explanation: Methane (CH₄) is a covalent compound and exists as a gas at room temperature. It does not conduct electricity, is a saturated hydrocarbon, and is not formed from a metal and a non-metal.
Question
The structures of three organic compounds are shown.
Which statement about these three compounds is correct?
A. They are alcohols.
B. They are alkenes.
C. They are saturated.
D. They do not burn.
▶️Answer/Explanation
Answer: C. They are saturated.
Explanation: The compounds shown are alkanes, which are saturated hydrocarbons. They contain only single bonds between carbon atoms and can burn in the presence of oxygen.