CIE iGCSE Co-Ordinated Science C11.2 Naming organic compounds Exam Style Questions Paper 1
Question
In which row is the name of the structure correct?
▶️Answer/Explanation
Ans : C
Question
Four molecules are shown. Which structure represents ethanol?
▶️Answer/Explanation
Answer: A
Explanation: Ethanol has the chemical formula C2H5OH, which corresponds to structure A. The other structures represent different organic compounds.
Question
The molecular structure of a compound is shown.
What is this type of compound?
A. a hydroxide
B. an alcohol
C. an alkane
D. an alkene
▶️Answer/Explanation
Answer: B. an alcohol
Explanation: The molecular structure contains an -OH group, which is characteristic of alcohols. Hydroxides, alkanes, and alkenes do not have this functional group.
Question
Which diagram represents a molecule of ethane?
▶️Answer/Explanation
Answer: C
Explanation: Ethane (C2H6) consists of two carbon atoms single-bonded to each other, with each carbon atom bonded to three hydrogen atoms. Diagram C correctly represents this structure.
Question
Which structure represents ethanol?
▶️Answer/Explanation
Answer: D
Explanation: Ethanol has the chemical formula C2H5OH, and the correct structure should show this arrangement.
Question
The structures of four compounds are shown.
What are the names of the compounds?
▶️Answer/Explanation
Answer: A
Explanation: The compounds are correctly identified as ethane (C2H6), ethanol (C2H5OH), ethene (C2H4), and methane (CH4).