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JAMB Chemistry 1986 Question 45

Question 45

Introduction to Organic Chemistry

Which is the structural formula for pent-2-enoic acid?

Diagram for this question
  1. A.Structure A
  2. B.Structure B
  3. C.Structure C
  4. D.Structure D
Show the answer and explanation

Answer: C (Structure C)

Explanation

Pent-2-enoic acid is CH3CH2CH=CHCOOH: five carbons, a –COOH group, and a C=C between carbons 2 and 3 counting from the COOH carbon. Structure C shows this; B ends in a ketone group, not –COOH, and D has no double bond.