WAEC Chemistry 2021 Objective — Question 20

Question 20 of 50 from the West African Examinations Council (WAEC) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

20. Consider the structure below (a carbon chain with -OH, a C2H5 branch, and a C=O group). How many carbon atoms does the parent chain contain?

• A. 5
• B. 4Correct
• C. 3
• D. 2

Explanation

Counting the longest continuous chain including the OH and C=O carbons gives 4 carbon atoms in the parent chain.

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